All Problems

Problems

#1Poisson Distribution Derivation

Hard

#2Card Game

Easy

#3Coin Game

Medium

#4Random Ants

Medium

#5Drunk Passenger

Medium

#6Jon & Ross

Medium

#7N Points on a Circle

Hard

#8Poker Hands

Medium

#9Hopping Rabbit

Easy

#10Pirate Loot

Medium

#11First To 5k

Medium

#12Handshakes

Easy

#13Car Wash

Medium

#14Chessboard

Medium

#15Painted Cube

Easy

#16Tigers & Sheep

Easy

#17Box

Hard

#18Which Switch?

Medium

#19Pet Count

Easy

#20Class Enrollment

Easy

#21Horse Race

Medium

#22River Crossing

Easy

#23Burning Ropes

Easy

#249 Beans

Easy

#25Duck or Hell

Medium

#26Digit Count

Easy

#27Sock Drawer

Easy

#286 Horses

Medium

#2951 Ants

Medium

#30Enemies

Easy

#31Manhattan Commute

Medium

#32Hungry Donkey

Hard

#33Website Visitors

Medium

#34Olympic Team

Medium

#35Royal Before 7

Medium

#363 Frogs

Medium

#37How Many Terms?

Easy

#38Binomial Expansion

Medium

#39Multinomial Expansion

Medium

#40Tech Expo

Easy

#41Variance Properties

Medium

#42Commuters

Medium

#43King of Hearts

Medium

#44Dog Committee

Easy

#45Mississippi

Easy

#469 Flags

Easy

#47Birthdays

Medium

#48Donut Shop

Hard

#495 Dice

Medium

#50Dinner Party

Easy

#51Married Dinner Party

Medium

#52Prove Inclusion-Exclusion

Hard

#53Sum to 19

Medium

#54Sum to 17

Hard

#555 Letters

Medium

#56Ice Cream Truck

Medium

#57Surjective Functions

Medium

#589 Letters

Medium

#59Smokers

Easy

#60Permutations Up To 9

Medium

#61Half Deranged

Medium

#62Stirling Properties

Hard

#63Conditional Probability Properties

Medium

#64Geometric Series

Medium

#65Series Summation

Medium

#66Sums of Money

Medium

#67Recurrence Relation

Medium

#68Build Table

Medium

#69Faulty Test?

Easy

#70Office Occupation

Hard

#71Cashier

Easy

#72Derangement Limit

Hard

#73Sum to 34

Hard

#74Sarah & Bob

Medium

#75Root Two

Easy

#76Coin Toss Game

Medium

#77Upface Correlation

Medium

#78Russian Roulette

Medium

#79Tommy Bird's Dice Rolls

Hard

#80Balls and Boxes

Easy

#81Office Arrangement

Medium

#82Restricted Partition

Easy

#83Dogs and Cats

Easy

#84Law of Total Probability

Medium

#85Lebron

Easy

#86Dice Order

Easy

#87Rainy Weekend

Medium

#88Flu Shot

Medium

#89Binomial EV and Variance

Hard

#90Unfair Die

Medium

#91Quality Control

Easy

#92EV & Variance Properties

Medium

#93Intersecting Chords

Medium

#947 Letters

Hard

#95Cows and Pigs

Medium

#962 Boys

Hard

#97Monty Hall

Hard

#98Gambler's Ruin

Hard

#99Two Dice

Medium

#100Joint Distribution Basics

Medium

#10130-Sided Dice

Medium

#102Fair Die Properties

Easy

#103Evarts Family

Medium

#104Painted Faces EV

Medium

#1053 Flips

Medium

#106LOTUS & LOTE

Medium

#107Elevator Ride

Medium

#108Broken Stick

Medium

#109Pascal's Triangle

Medium

#110Circular Hop

Medium

#111Exponential Distribution Derivation

Medium

#112Convex Polygon

Medium

#113Connecting Noodles

Hard

#1143x3 Grid Coloring

Medium

#1151 Digit Prime

Easy

#116Giraffe Social Club

Medium

#117Coupon Collection

Hard

#118Busy Intersection

Medium

#119Textbooks

Medium

#120Gardener

Medium

#121Orb Draw

Medium

#122Tail Sum

Medium

#123Geometric EV & Variance

Hard

#12410 In A Row

Hard

#125Rock Paper Scissors

Medium

#126Gamma Distribution Derivation

Hard

#127Dog Meet

Medium

#128Chomp

Hard

#129First Ace

Medium

#130Vandermonde's Identity

Hard

#134Dice Game EV

Easy

#135Hockey Stick Identity

Hard

#136Loopy Bus

Hard

#137Exponential & Gamma Properties

Hard

#138Uniform EV & Variance

Easy

#139Max and Min EV

Medium

#140Pizza Shop

Medium

#141Max and Min Correlation

Medium

#142Brand New Lightbulbs

Medium

#143Pancakes, Waffles, & Crepes

Hard

#144Flashlight Lifetime

Hard

#145Spade Variance

Hard

#146Fartcoin Hedge Ratio

Medium

#147Covariance & Correlation Properties

Hard

#148Parlay Correlation

Medium

#149N Boxes

Medium

#150Uniform Sum

Hard

#151Numbers in a Bowl

Medium

#152Normal Moments

Hard

#153Bryan and Daniel Eat Chow Mein

Medium

#154Bowling Club

Easy

#155Expected Chord Length

Hard

#156Busted 6 (Wald's)

Medium

#157Differ By 2

Medium

#158Carded Pair

Hard

#159Battery Lifetime

Medium

#160Geometric Memory & NegBin Moments

Medium

#161Ty, Guy, and Psy

Medium

#162Hypergeometric EV & Variance

Hard

#163Amoeba Population

Medium

#164Candies in a Jar

Hard

#165Absolute Normal Difference

Medium

#166Normal Addition

Medium

#167Discrete Order Stats

Hard

#168Expected Runs

Medium

#169Acorn Hunt

Easy