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778
Questions
Tags
1 Dot Removed
Easy
probability
1 Leftward Jump
Medium
probability
10 Consecutive Heads
Medium
probability
105 Pebbles
Hard
brainteasers
14 Marbles
Medium
probability
1s And 9s
Medium
probability
2 Combinations
Easy
2 Eggs
Medium
brainteasers
2 Or 11
Medium
probability
2, 4 and 6
Medium
brainteasers
2014 Stones
Medium
brainteasers
2D Jumps
Medium
probability
2x3 Grid
Easy
probability
3 Bus Stops
Easy
brainteasers
3 consecutive heads I
Easy
3 Consecutive Heads II
Easy
probability
3 Dice Minimum
Hard
probability
3 Eggs
Hard
brainteasers
3 Heads 3 Tails I
Medium
probability
3 Heads 3 Tails II
Medium
probability
3 Heads 3 Tails III
Easy
probability
3 Lights
Medium
probability
3 Marbles Remaining
Easy
probability
3D Tic-tac-toe
Medium
combinatorics
4 Die Sum
Easy
probability
4 Head 1
Easy
40-sided And 60-sided Die
Easy
probability
4x4 Array
Medium
combinatorics
5 Head 2
Easy
5 Points On A Sphere
Hard
probability
5-runs
Hard
probability
50 Wise Men
Hard
brainteasers
500 Sided Dice
Medium
probability
5000 Sets
Medium
combinatorics
7994 Stones
Hard
brainteasers
800 Marbles
Easy
probability
Acute Triangle
Hard
probability
Adding 1 Or 2
Medium
probability
Additional Info Coin Flips
Hard
probability
Additional Info Die Rolls
Medium
probability
Alice Rolled The 6
Medium
probability
All Odds Before Even
Easy
probability
Alternating Sum Sum
Hard
brainteasers
Ant On A Cube I
Medium
probability
Ant On A Cube II
Medium
probability
Ant On A Cube III
Medium
probability
Ant On An Icosahedron
Hard
probability
Ants On A Circle I
Medium
probability
Ants On A Circle II
Hard
probability
Ants On A Circle III
Hard
probability
Ants On A Circle IV
Hard
probability
Ants On A Wire
Easy
brainteasers
Ants On An Octahedron
Hard
probability
Apples And Oranges
Medium
probability
Archery I
Medium
probability
Arrange Teams
Medium
brainteasers
Arrow On Dice
Medium
combinatorics
Asking For A Date
Hard
probability
Asset Price
Easy
probability
Assigning Numbers To Dice
Medium
combinatorics
At Least Six I
Medium
probability
At Least Six II
Hard
probability
Average Drawn
Easy
probability
Average Squared Distance
Medium
probability
B Before O I
Medium
combinatorics
B Before O II
Medium
combinatorics
Bacteria Population
Easy
probability
Bacteria Population I
Medium
probability
Bacteria Population III
Medium
brainteasers
Ball With Maximum Value
Medium
probability
Balls In Garbage Bag
Hard
probability
Baseball Series
Easy
probability
Bernoulli Matrix
Easy
probability
Biased Coin Game I
Medium
probability
Binary Cards Removal
Hard
brainteasers
Binary Trailing Zeros
Medium
brainteasers
Blackboard
Hard
probability
Blue Marble Remaining
Medium
probability
Blue, Ugly And Special
Medium
probability
Boat And Steamer
Easy
brainteasers
Bot Move
Medium
probability
Boy-girl Adjacent Pairs
Medium
probability
Bridge Crossing
Medium
brainteasers
Broken Calculator
Hard
brainteasers
Broken Elevator
Hard
probability
Broken Stick I
Medium
probability
Broken Stick II
Medium
probability
Bulb Factory
Easy
probability
Bulb Toggle I
Medium
brainteasers
Bulb Toggle II
Medium
brainteasers
Bulb Toggle III
Hard
brainteasers
Bulbs In A Grid
Medium
probability
Buying Tickets
Hard
probability
Candy Distribution
Medium
brainteasers
Cannons
Easy
combinatorics
Car Clusters
Hard
probability
Car Crash
Easy
probability
Card Flipping Game
Medium
brainteasers
Card Picking I
Medium
probability
Card Picking II
Medium
probability
Card Picking III
Medium
probability
Careful Soldiers
Hard
brainteasers
Catch Me If You Can I
Medium
brainteasers
Catch Me If You Can II
Hard
brainteasers
Central Cities
Easy
combinatorics
Chain Link
Medium
brainteasers
Changing Number
Hard
brainteasers
Cheating Husbands
Medium
brainteasers
Checks
Medium
probability
Cherries
Medium
probability
Chess Tournament I
Medium
probability
Chess Tournament II
Medium
probability
Chess Tournament III
Medium
probability
Chess Tournament IV
Medium
probability
Chess Tournament V
Medium
probability
Chess Tournament VI
Easy
probability
Chess Tournament VII
Medium
probability
Chocolate Bar
Easy
brainteasers
Chocolate Problem
Hard
probability
Choose Values III
Medium
probability
Chords Forming Quadrilateral
Easy
probability
Chords Intersection I
Medium
probability
Chords Intersection II
Hard
probability
Circle Fitting II
Medium
probability
Circle In 3 Quadrants
Hard
probability
Circuit
Medium
probability
Circular Frog
Hard
probability
Circular Regions
Easy
probability
Circular Seating
Medium
probability
Circular Table I
Medium
probability
Clock Angle
Easy
brainteasers
Close Factors
Easy
brainteasers
Coin And Die Together
Easy
probability
Coin Coloring Game
Hard
probability
Coin Equalizer
Hard
probability
Coin Inside Square
Easy
probability
Coin Reflip Game
Easy
probability
Coin Sequence Guess
Medium
probability
Coin Toss Game I
Medium
probability
Coin Toss Game II
Medium
probability
Coin Toss Game III
Medium
probability
Coin Toss Game IV
Medium
probability
Coin Toss Game V
Medium
probability
Coin Toss Game VI
Easy
probability
Coin Toss Game VII
Easy
probability
Coin Toss Movement
Medium
probability
Coin Transactions
Hard
probability
Collinear Integer Points
Medium
brainteasers
Color And Roll
Easy
probability
Combining Turtles
Easy
probability
Complex Circle
Medium
probability
Conditional Expected Rolls
Medium
probability
Conditional Inequality
Easy
probability
Conditional Normal I
Easy
probability
Conditional Normal II
Medium
probability
Conditional Normal III
Medium
probability
Conditional One
Easy
probability
Connected Components I
Medium
probability
Consecutive 1s
Easy
probability
Consecutive Integral Envelopes
Medium
probability
Constrained Combinatorics
Medium
combinatorics
Constrained Digits
Easy
combinatorics
Constrained Subsets I
Easy
combinatorics
Constrained Subsets II
Medium
combinatorics
Constrained Subsets III
Medium
combinatorics
Constrained Subsets IV
Medium
brainteasers
Contained Projection
Hard
probability
Contiguous THTH
Medium
probability
Count 9s
Easy
brainteasers
Count Bitonic Permutations
Medium
combinatorics
Count Digits I
Medium
brainteasers
Count Handshake Pairs
Medium
combinatorics
Count Of Rational Numbers
Easy
combinatorics
Count Paths I
Easy
combinatorics
Count Paths II
Medium
combinatorics
Count Paths III
Hard
combinatorics
Count Rankings
Medium
combinatorics
Count Rectangles I
Easy
combinatorics
Count Rectangles II
Medium
combinatorics
Count Regions I
Medium
combinatorics
Count Regions II
Medium
combinatorics
Count Regions III
Hard
combinatorics
Count Regions IV
Hard
combinatorics
Count Sequences I
Medium
combinatorics
Count Sequences II
Medium
combinatorics
Count Solutions
Easy
combinatorics
Count Triangular Regions I
Easy
combinatorics
Count Triangular Regions II
Medium
combinatorics
Couple I
Medium
probability
Crazy Weights Arrangement
Hard
combinatorics
Creating Zero
Medium
brainteasers
Cube Fitting I
Easy
brainteasers
Cutting Cube
Medium
brainteasers
Diagonal Cut I
Medium
brainteasers
Diagonal Cut II
Medium
brainteasers
Dice Difference I
Medium
probability
Dice Difference II
Medium
probability
Dice Difference III
Hard
probability
Dice Game I
Medium
probability
Dice Game II
Medium
probability
Dice Game III
Medium
probability
Dice Game IV
Medium
probability
Dice Game V
Medium
probability
Dice Game VI
Medium
probability
Dice Game VII
Medium
probability
Dice Game VIII
Medium
probability
Dice Multiple I
Medium
probability
Dice Pattern Game I
Medium
probability
Dice Permutation
Medium
probability
Dice Rolls Product
Hard
probability
Dice Sum Parity
Medium
probability
Dice Triangle
Easy
probability
Dice Triangle II
Hard
probability
Die Roll LCM
Hard
probability
Difficult Die Constraints
Hard
Probability
Digit Multiply I
Medium
brainteasers
Digit Multiply II
Medium
brainteasers
Digit Picking
Medium
probability
Digit Sum I
Easy
combinatorics
Digit Sum II
Easy
combinatorics
Digit Sum IV
Medium
brainteasers
Digit Sum V
Easy
brainteasers
Direction Change I
Medium
probability
Direction Change II
Medium
probability
Disjoint Arcs
Medium
probability
Distant Points
Medium
probability
Distinct Faces
Medium
probability
Distinct Number Count
Medium
probability
Divisible By 37
Medium
brainteasers
Divisible By 5
Medium
brainteasers
Divisible Permutation
Medium
combinatorics
Dominant Flip
Medium
probability
Domino Tiling I
Medium
combinatorics
Domino Tiling II
Hard
combinatorics
Dot Product
Medium
probability
Double Factorial
Medium
brainteasers
Double Headed Coin I
Easy
probability
Double Headed Coin II
Easy
probability
Double Value
Easy
probability
Draw A Spade
Medium
probability
Drunk Passenger I
Hard
probability
Drunk Passenger II
Hard
probability
Drunk Passenger III
Hard
probability
Duck Escape
Medium
brainteasers
Early 5s
Medium
probability
Early Head Probability
Medium
probability
Easy Card Expectation
Easy
probability
Elevator I
Easy
probability
End With 2018
Easy
probability
Ending At 1
Medium
probability
Equal Heads
Easy
probability
Equal Logarithms
Easy
probability
Erase
Easy
brainteasers
Even Head Stop I
Medium
probability
Even Head Stop II
Medium
probability
Even Lattice Points
Medium
probability
Even Majority
Medium
probability
Even Marbles Everywhere
Medium
probability
Even Or Odd
Easy
probability
Even Ratio
Hard
probability
Even Squares
Medium
brainteasers
Even Tails Run
Medium
probability
Evenbin I
Medium
brainteasers
Evenbin II
Medium
brainteasers
Everything Contained
Medium
probability
Everything Odd
Medium
probability
Exactly 2 Consecutive Heads
Medium
probability
Exactly 6
Easy
probability
Expectation Lower Bound
Medium
probability
Expected 2s
Medium
probability
Expected Absolute Difference
Easy
probability
Expected Arc Length I
Medium
probability
Expected Arc Length II
Hard
probability
Expected Arc Length III
Hard
probability
Expected Area
Easy
probability
Expected Area Of Intersection
Hard
probability
Expected Collisions I
Hard
probability
Expected Collisions II
Hard
probability
Expected Determinant
Medium
probability
Expected Good Points
Medium
probability
Expected Minimum
Medium
probability
Expected Minimum Distance
Medium
probability
Expected Minimum Till 5
Medium
probability
Expected Number Of Rectangles
Medium
probability
Expected Occupied Seats
Medium
probability
Expected Ones In Binary
Hard
probability
Expected Ping-pong Games
Easy
probability
Expected Remainder
Hard
probability
Expected Squared Area
Hard
probability
Expected Stock Price
Easy
probability
Expected Swaps
Hard
probability
Expected Value
Hard
probability
Expected Wait Time I
Easy
probability
Expected Wait Time II
Medium
probability
Expected Wait Time III
Medium
probability
Expected Wait Time IV
Medium
probability
Exponent Perfect Square
Easy
brainteasers
Exponential Inequality I
Easy
probability
Exponential Inequality II
Hard
probability
Extended Rock-Paper-Scissors
Medium
probability
Factorial Factor
Medium
probability
Factorial Vs Exponent
Medium
brainteasers
Falling Ants
Medium
brainteasers
Fibonnaci Error
Medium
brainteasers
Field Construction
Easy
probability
Fifth Card
Hard
brainteasers
Fill In The Blanks
Medium
probability
Final Number Possibilities
Medium
brainteasers
Find The Units Digit
Hard
brainteasers
Finding Seven
Hard
probability
First Ace
Medium
probability
First And Last Flip
Medium
probability
Fish Estimate
Easy
brainteasers
Five In Numerator
Easy
probability
Five Light Bulbs
Medium
probability
Fixed Maximum
Medium
probability
Fixed Points I
Easy
probability
Forming Quadratic Polynomial I
Hard
probability
Forming Quadratic Polynomial II
Hard
probability
Forming Quadratic Polynomial III
Hard
probability
Free Throws
Hard
probability
Frog Return
Medium
probability
Functional Equation
Medium
brainteasers
Gambler's Ruin I
Medium
probability
Gambler's Ruin II
Hard
probability
Game Of Chords
Medium
brainteasers
Game Of Cuts
Medium
brainteasers
Game Of Discarding Cards
Easy
probability
Game Of Evaluation
Medium
brainteasers
Game Of Moving Rooks
Medium
brainteasers
Game Of Placing Kings
Medium
brainteasers
Game Of Placing Knights
Medium
brainteasers
Game Of Smaller Number
Medium
probability
Game Of Subtracting Digits
Medium
brainteasers
Game On 1-10
Medium
brainteasers
Game On 2 Piles
Medium
brainteasers
Game On 753 Coins
Medium
brainteasers
Game On Circle
Medium
brainteasers
Game On Divisors I
Hard
brainteasers
Game On Divisors II
Hard
brainteasers
Game On Divisors III
Medium
brainteasers
Game On Divisors IV
Hard
brainteasers
Game On Grid
Hard
brainteasers
Game On Jar
Hard
probability
Game On Prime Numbers
Hard
brainteasers
GCD Expectation
Medium
probability
Geometric Progression
Hard
probability
Get Heads
Medium
probability
Get King And Ace
Medium
probability
Get More Heads
Hard
probability
Getting Singular Matrix
Medium
probability
Given LCM
Easy
combinatorics
Going In Circles
Medium
probability
Gold Auction
Medium
probability
Gold Thief
Easy
brainteasers
Graph Travel I
Medium
probability
Greedy Pirates I
Easy
brainteasers
Greedy Pirates II
Hard
brainteasers
Green And Yellow Dice
Easy
probability
Green Ball Draw
Easy
probability
Grid Arrangement I
Medium
combinatorics
Grid Arrangement II
Medium
combinatorics
Grid Arrangement III
Medium
combinatorics
Grid Arrangement IV
Medium
probability
Grid Conversion
Medium
brainteasers
Grid Frog I
Hard
combinatorics
Grid Frog II
Hard
combinatorics
Grid Paint I
Hard
brainteasers
Grid Travel I
Medium
combinatorics
Guess The End
Hard
probability
Half Permutation
Medium
probability
Half Right Hats
Medium
brainteasers
Hands Interchange
Medium
brainteasers
Handshakes On A Chessboard
Medium
probability
Handy Subsets
Hard
combinatorics
Hanging Chain
Medium
brainteasers
Hard Card Expectation
Hard
probability
Hard Grid Arrangement
Hard
combinatorics
Head-tail Product
Easy
probability
Heads Run I
Medium
probability
Heads Run II
Hard
probability
Heaven Or Hell
Hard
probability
Heavy Group
Easy
probability
Hexagon Inside Hexagon
Medium
probability
Higher Roll I
Medium
probability
Higher Roll II
Medium
probability
Higher Sum
Easy
probability
Highest Roll EV
Medium
probability
Home Run
Medium
probability
Horse Racing
Medium
brainteasers
How Many 5s
Medium
probability
Hungry Driver
Hard
brainteasers
Increasing Birthdays
Easy
probability
Increasing Decreasing
Medium
combinatorics
Increasing Dice Rolls I
Medium
probability
Increasing Dice Rolls II
Hard
probability
Increasing Dice Rolls III
Easy
probability
Increasing Game
Medium
brainteasers
Increasing Random Variables
Medium
probability
Increasing Rolls Expectation
Hard
probability
Inequality In Normal Distribution I
Medium
probability
Inequality In Normal Distribution II
Medium
probability
Inequality In Normal Distribution III
Easy
probability
Inequality In Normal Distribution IV
Medium
probability
Infection Spread
Medium
brainteasers
Infectious Ants
Hard
probability
Infinite Notes
Medium
brainteasers
Inflating Balloon
Easy
brainteasers
Information Transfer
Medium
probability
Initial Roll
Easy
probability
Inside The Range
Medium
combinatorics
Integer Selection
Medium
probability
integral angles
Easy
Interesting Average I
Medium
probability
Interesting Average II
Medium
brainteasers
Interesting Average III
Medium
probability
Interesting Constraints
Medium
brainteasers
Interesting Division
Easy
brainteasers
Interesting Summation I
Hard
brainteasers
Interesting Summation II
Medium
brainteasers
Interesting Summation III
Hard
brainteasers
Interesting Summation V
Hard
probability
Intersecting Subsets
Medium
probability
Interview I
Hard
probability
Interview II
Hard
probability
Interview III
Hard
probability
Interview IV
Hard
probability
Is It A Perfect Square?
Medium
brainteasers
Is It Fibonacci?
Medium
brainteasers
It Took Ten Turns
Hard
probability
Jet Trail Intersection
Hard
probability
Jumping Frog I
Medium
probability
Jumping Frog II
Medium
probability
Jumping Frog III
Easy
combinatorics
Jumping Frog IV
Medium
combinatorics
Jumping Frog IX
Medium
probability
Jumping Frog V
Medium
combinatorics
Jumping Frog VI
Easy
probability
Jumping Frog VII
Medium
probability
Jumping Frog VIII
Hard
probability
Just Even Stop
Medium
probability
k-inversions
Medium
probability
Keep The GCD High
Hard
brainteasers
King Before Ace
Hard
probability
King, Queen, Ace I
Medium
probability
King, Queen, Ace II
Medium
probability
Knight Return
Hard
probability
Large Cycles
Hard
probability
Large Language Model
Hard
combinatorics
Largest 2 Factor
Medium
probability
Largest 3
Easy
probability
Largest Area Expectation
Hard
probability
Largest In Smallest
Medium
probability
Largest Mean Median Difference
Easy
brainteasers
Largest Prime Probability
Medium
probability
Largest Sum Subset
Hard
brainteasers
Last Ball
Medium
brainteasers
Last Number Deleted
Hard
brainteasers
Last One Off
Hard
probability
Last To Front
Medium
probability
Learning To Walk
Hard
probability
Least Multiple Of 15
Easy
brainteasers
Least N
Medium
brainteasers
Letter-envelope Pairing
Hard
probability
Lily Pad
Easy
brainteasers
Line Splits I
Medium
probability
Local Maxima
Medium
probability
Logarithm Comparison
Medium
brainteasers
Losing It All
Easy
probability
Lottery
Medium
probability
Low Median
Easy
probability
M,P,F,G
Easy
probability
Marble Swap I
Medium
probability
Marble Swap II
Medium
probability
Marble Swap III
Medium
probability
Matching Cards Removal
Medium
probability
Mathematical Expression I
Hard
probability
Mathematical Expression II
Medium
probability
Mathematical Expression III
Easy
combinatorics
Matrix Attack I
Medium
probability
Matrix Attack II
Hard
brainteasers
Matrix Attack III
Hard
probability
Max Equals Min
Easy
probability
Max Fill
Medium
brainteasers
Max Min Ratio
Medium
probability
Maxima Sum I
Medium
probability
Maxima Sum II
Medium
probability
Maximising Heads I
Easy
probability
Maximising Heads II
Easy
probability
Maximize Product
Medium
brainteasers
Maximize RPS Wins
Medium
brainteasers
Maximum Fraction Sum
Easy
brainteasers
Maximum Rolled Value
Medium
probability
Maximum Till Now I
Medium
probability
Maximum Till Now II
Medium
probability
Maximum Within An Interval
Medium
probability
Measuring Everything I
Medium
brainteasers
Measuring Everything II
Hard
brainteasers
Median Roll
Easy
probability
Meet Again
Easy
brainteasers
Meeting Probability
Medium
probability
Min Collinearity
Medium
brainteasers
Min, Median, Max Guess
Hard
probability
Minimum Correlation
Medium
probability
Missing Pairwise Product
Easy
brainteasers
Missing Sequence
Medium
combinatorics
Monochromatic Removal
Medium
probability
Monotonic Subsequences
Easy
combinatorics
Monster Escape I
Hard
probability
Monster Escape II
Medium
probability
Moth On A Cube
Medium
combinatorics
moving ants I
Easy
Moving Ants II
Easy
probability
Moving Ants III
Hard
probability
Moving Checker
Medium
probability
Moving The Piece I
Hard
brainteasers
Moving The Piece II
Hard
brainteasers
N Point Variance
Medium
probability
N-Palindrome
Easy
brainteasers
Nearest Circular Neighbor
Medium
probability
Nearest Diagonal I
Easy
probability
Nearest Diagonal II
Medium
probability
Never Divisible By 3
Hard
probability
New Language
Easy
combinatorics
Next Date I
Medium
brainteasers
Nine Children
Medium
brainteasers
No Adjacent Standing Pair
Hard
probability
No Chords Intersecting
Medium
probability
No Empty Bucket
Medium
probability
No Fives
Easy
probability
No Intersections
Medium
probability
No Rocks Allowed
Medium
probability
Non-absorbing Random-walk
Medium
probability
Non-empty Buckets
Easy
probability
Non-empty Intersection
Hard
probability
Non-linearity Of Expectation
Hard
probability
Non-negative Expectation
Easy
probability
Noodle Loop
Hard
probability
Normal Distributions
Medium
probability
Not That Easy
Easy
probability
Numerator I
Medium
brainteasers
odd heads I
Easy
Odd Heads II
Medium
probability
Odd Heads III
Medium
probability
Odd Sum Revisited
Medium
probability
One Colored Face
Medium
probability
Only Consecutive Heads
Medium
probability
Optimal Bid
Medium
probability
Optimal Card Guessing
Medium
probability
Optimal Die Choice
Medium
probability
Ordered Pairs In Permutation
Hard
probability
Origin In Between
Easy
probability
Painted Cube I
Medium
probability
Painted Cube II
Medium
probability
Painted Cube III
Medium
probability
Pair Partition
Hard
combinatorics
Palindrome Summation
Medium
brainteasers
Pandemic I
Easy
brainteasers
Parking Lot I
Hard
probability
Parking Lot II
Hard
probability
Partial Exponential I
Medium
probability
Partial Exponential II
Medium
probability
Particle Reach I
Medium
probability
Particle Reach II
Medium
probability
Party Groups I
Hard
probability
Party Groups II
Hard
probability
Passing The Bottle
Hard
probability
Passing The Coin I
Easy
probability
Passing The Coin II
Easy
probability
Passing The Parcel
Medium
probability
Password
Medium
combinatorics
Payment
Medium
probability
Perfect Rank Guess
Hard
probability
Perfect Ratio
Hard
probability
Permutation Blocks
Hard
probability
Permutation Return
Medium
probability
Permutation Variance
Hard
probability
Phone Connection
Medium
brainteasers
Pistol Shots
Easy
brainteasers
Pizza Standard Deviation
Easy
probability
Place Or Take
Hard
probability
Plus One, Minus One
Hard
brainteasers
Points On A Square
Medium
probability
Points On The Same Face
Medium
probability
Poisoned Chocolates
Hard
brainteasers
Poisoned Wine I
Hard
brainteasers
Poisoned Wine II
Hard
brainteasers
Poisson Cards
Hard
probability
Polygon Constraints
Medium
brainteasers
Polygon Triangle
Medium
probability
Polynomial Coefficient
Hard
brainteasers
Positive Product
Medium
probability
Possible Cover
Medium
brainteasers
Power Factor
Medium
probability
Powerful Three
Medium
brainteasers
Pppower
Medium
brainteasers
Predicting King Draws
Medium
probability
Prime Dice
Easy
probability
Prime Set
Easy
brainteasers
Prime Sum
Easy
probability
Prism Count
Easy
combinatorics
Prisoner Hats
Medium
brainteasers
Prisoner Hats-multicolor
Hard
brainteasers
Probabilistic Strategy I
Easy
probability
Probabilistic Strategy II
Medium
probability
Probabilistic Strategy IV
Medium
probability
Probability Of Everything
Medium
probability
Probability Of Subset
Hard
probability
Product Of Cards
Hard
brainteasers
Product Of Solutions
Hard
combinatorics
Proof Type Qn
Medium
Proportional Coordinates
Medium
probability
Proportional Dice
Easy
probability
Queen Before King
Easy
probability
Rabbit On A Square Grid
Medium
combinatorics
Random Knight Movement
Hard
probability
Random Pairing
Medium
probability
Random Point On Disc
Easy
probability
Random Segments
Medium
probability
Ranged Guess
Hard
probability
Reach Multiple Of 7
Easy
probability
Reaching 50
Medium
brainteasers
Real Addition I
Easy
brainteasers
Real Addition II
Easy
brainteasers
Red Blue Game
Hard
probability
Red Card Prediction
Medium
probability
Regular 21-gon
Medium
probability
Regular Octagon
Medium
probability
Remainders
Medium
brainteasers
Remove Neighbor
Medium
brainteasers
Remove Or Flip
Medium
brainteasers
Remove The Subtree
Hard
probability
Repeated Erase
Hard
probability
Rigged Game
Medium
probability
Rock Paper Scissors
Easy
brainteasers
Roll Die Till 65
Medium
probability
Roll Till Even
Easy
probability
Rolling Everything I
Medium
probability
Rolling Everything II
Hard
probability
Rook Moves
Medium
probability
Rope Variance
Medium
probability
Russian Roulette I
Easy
probability
Russian Roulette II
Easy
probability
Same Arc I
Hard
probability
Same Arc II
Hard
probability
Same Birthday Probability
Medium
probability
Same Cards
Medium
probability
Same Color Corners
Medium
brainteasers
Same Part
Medium
probability
Same Sum Subsets
Hard
brainteasers
Same Temperature
Hard
brainteasers
Same Values On Dice
Medium
probability
Scary Permutation
Hard
combinatorics
Segment Intersection
Medium
brainteasers
Segment Overlap
Medium
probability
Segments Inside Square
Hard
probability
Self-avoiding Paths
Hard
combinatorics
Sensor Signal
Medium
probability
Set Intersection
Medium
probability
Seven Colors I
Easy
probability
Seven Colors II
Hard
probability
Seven Colors III
Hard
probability
Shadow
Medium
brainteasers
Sharing A Secret
Medium
combinatorics
Ship Destroyer
Medium
probability
Shooting Arrows I
Easy
probability
Shooting Stacks
Easy
combinatorics
Signal To Noise Ratio
Medium
probability
Simpson's Paradox
Medium
brainteasers
Simulate 1/3
Easy
probability
Singer's Location
Easy
probability
Skipping 2s
Medium
combinatorics
Small Chords
Medium
probability
Smallest Set
Hard
brainteasers
Socks Remaining I
Hard
probability
Socks Remaining II
Hard
probability
Sorted Rows
Medium
probability
SOS Game
Hard
brainteasers
Sphere Variance
Medium
probability
Sports Betting
Easy
probability
Square Factor
Easy
probability
Square Fitting I
Medium
probability
Square Fitting II
Medium
probability
Square Intersection
Easy
probability
Standing Table I
Hard
probability
Standing Table II
Hard
probability
Standing Table III
Hard
probability
Starting With Heads
Medium
probability
Stop Or Continue
Easy
probability
Strange Comparison I
Medium
brainteasers
Strange Comparison II
Medium
brainteasers
Strange Die
Medium
probability
Strange Party
Easy
brainteasers
Strictly Within
Hard
probability
Subset Chain
Medium
combinatorics
Subset Length Sum
Hard
combinatorics
Sum Of Divisor Ratio
Easy
brainteasers
Sum Of Products
Hard
brainteasers
Sum Over I
Hard
probability
Sum Sum Sum
Hard
brainteasers
Summation Series I
Hard
probability
Summation Series II
Hard
probability
Summation Series III
Hard
probability
Summation Series IV
Hard
probability
Tails Removal
Medium
probability
Ten Cars Meet
Hard
probability
Tennis Odds
Medium
probability
Tennis Tournament
Easy
probability
Tenth Toss
Hard
probability
Tetrahedral Dice Game
Medium
probability
Tetrahedral Die I
Medium
probability
Tetrahedral Die II
Hard
probability
Tetrahedron Coloring I
Easy
combinatorics
Tetrahedron Coloring II
Easy
combinatorics
Three In A Line
Medium
brainteasers
Three Pegs
Hard
brainteasers
Three Steps
Hard
probability
Tic Tac Toe
Medium
probability
Tigers And The Sheep
Easy
brainteasers
Tired Rabbit
Medium
probability
To Infinity And Beyond I
Medium
probability
To Infinity And Beyond II
Medium
probability
Too Many Hats
Hard
brainteasers
Too Many Unknowns
Hard
probability
Toss Exceedance
Medium
probability
Trailing Zeros I
Easy
brainteasers
Trailing Zeros II
Medium
brainteasers
Training Sessions
Easy
combinatorics
Treasure Island
Medium
brainteasers
Triangle Angle I
Easy
probability
Triangle Formation I
Medium
probability
Triangle Formation II
Medium
probability
Triangle Formation III
Medium
probability
Triangle Inside Circle I
Medium
probability
Triangle Inside Circle II
Medium
probability
Triangle Inside Circle III
Hard
probability
Triangle Sum
Medium
combinatorics
Triangle Tiling
Medium
combinatorics
Triangles Inside Triangle
Easy
combinatorics
Triangular Grid
Medium
probability
Tricky Palindrome I
Easy
combinatorics
Tricky Palindrome II
Medium
combinatorics
Tricky Palindrome III
Hard
combinatorics
Truth
Medium
brainteasers
Two Coins Remaining I
Easy
brainteasers
Two Coins Remaining II
Hard
brainteasers
Two Random Points
Medium
probability
Two Rolls Reward
Easy
probability
Unequal Neighbors
Hard
brainteasers
Unfair Advantage
Hard
probability
Unfair Rock Paper Scissors
Medium
probability
Uniform Number Bet I
Hard
probability
Uniform Random Variables I
Easy
probability
Uniform Random Variables II
Easy
probability
Uniform Sum Probability
Hard
probability
Unique Birthdays Expectation
Medium
probability
Unique Ids
Medium
combinatorics
Unit Digit Probability I
Easy
probability
Unit Digit Probability II
Medium
probability
Unknown Balls
Medium
probability
Unlucky Seven
Medium
probability
Up, Right And Diagonal
Medium
probability
Variable Game
Medium
probability
Variance Maximum
Medium
probability
Vector Toggle
Hard
probability
Vending Machine I
Medium
probability
Vertical Hit
Easy
probability
W-permutation
Medium
probability
Watermelon Weight
Easy
brainteasers
Weighing Coins I
Easy
brainteasers
Weighted Coins
Hard
probability
Weighted Die
Medium
probability
Win-win
Medium
probability
Winning Odds
Easy
probability
Word Problem I
Medium
probability
XXYYYYZZ
Medium
combinatorics
Yet Another Game
Hard
brainteasers
Your Choice
Medium
probability

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The Ultimate Grind