| Birthday Collision | Probability | easy |
| Card Game Expected Value | Probability | easy |
| Medical Test - Bayes' Theorem | Probability | easy |
| Generalized Monty Hall Problem | Probability | easy |
| Expected Flips to See Both Sides | Probability | easy |
| Car Crashes on a Highway | Probability | easy |
| 3 Consecutive Heads II | Probability | easy |
| Connected Components I | Probability | easy |
| All Odds Before Even | Probability | easy |
| Ants On A Circle I | Probability | easy |
| 40-sided And 60-sided Die | Probability | easy |
| Card Picking III | Probability | easy |
| At Least Six I | Probability | easy |
| Gambler's Ruin I | Probability | easy |
| 3 Consecutive Heads II | Probability | easy |
| Bernoulli Matrix | Probability | easy |
| Coin Inside Square | Probability | easy |
| Car Crash | Probability | easy |
| Circular Regions | Probability | easy |
| Higher Sum | Probability | easy |
| 2 Or 11 | Probability | easy |
| 500 Sided Dice | Probability | easy |
| 1 Dot Removed | Probability | easy |
| Conditional Inequality | Probability | easy |
| Coin Toss Game IV | Probability | easy |
| Coin Toss Game III | Probability | easy |
| Dice Roll Probability | Probability | medium |
| Gambler's Ruin | Probability | medium |
| Expected Flips Until First Heads | Probability | easy |
| Coupon Collector Problem | Probability | medium |
| Two-State Markov Chain Steady State | Probability | medium |
| Probability of Winning a Best-of-N Series | Probability | medium |
| Poisson Distribution Probability | Probability | medium |
| Card Drawing - Hypergeometric Distribution | Probability | medium |
| Central Limit Theorem - Sum Exceeds Threshold | Probability | hard |
| Gambler's Ruin - Martingale Stopping | Probability | hard |
| Kelly Criterion - Optimal Bet Size | Probability | medium |
| Expected Rolls Until Consecutive Match | Probability | medium |
| Dice Sequence Probability | Probability | medium |
| Maximum of N Dice | Probability | easy |
| Dice Sum Reaches Target | Probability | medium |
| Two Player Dice Duel | Probability | easy |
| Die Reroll Strategy | Probability | medium |
| Newton's Dice Problem | Probability | hard |
| Distinct Faces in N Rolls | Probability | easy |
| Run of K Sixes | Probability | hard |
| Conditional Die Sum | Probability | medium |
| Random Walk First Return | Probability | medium |
| Ballot Problem | Probability | medium |
| Hat Matching Problem (Derangements) | Probability | medium |
| Stick Breaking: Expected Longest Piece | Probability | medium |
| Secretary Problem (Optimal Stopping) | Probability | hard |
| Expected Flips to See Coin Pattern | Probability | hard |
| Expected Cards Until Target | Probability | easy |
| Expected Matching Birthday Pairs | Probability | medium |
| Exponential Minimum Survival Probability | Probability | easy |
| Expected Cycles in Random Permutation | Probability | hard |
| MGF Moment Extraction | Probability | medium |
| Hoeffding Bound | Probability | medium |
| Certainty Equivalent | Probability | medium |
| Optimal Dice Stopping | Probability | medium |
| Increasing Dice Sequence | Probability | medium |
| Conditional Dice Sum | Probability | easy |
| First to Roll a Six | Probability | easy |
| Matching Dice Faces | Probability | medium |
| Dice Duel: Max vs Single | Probability | medium |
| Decahedron Coupon Collector | Probability | medium |
| Alternating Coin Duel | Probability | easy |
| Expected Flips for N Consecutive Heads | Probability | medium |
| Double-Headed Coin Mystery | Probability | medium |
| Strictly More Heads Than Tails | Probability | medium |
| Identify the Biased Coin | Probability | easy |
| Odd One Out | Probability | medium |
| Winning Streak in Coin Flips | Probability | medium |
| Expected Position of First Ace | Probability | medium |
| Same Color Draw | Probability | easy |
| Card Position Match | Probability | medium |
| High Card Duel | Probability | easy |
| Poker Full House Probability | Probability | medium |
| Cards Until a Rank Match | Probability | medium |
| Adjacent Same-Suit Pairs | Probability | medium |
| Broken Stick Triangle | Probability | medium |
| The Meeting Problem | Probability | medium |
| Expected Maximum of Ten Uniform Draws | Probability | easy |
| Increasing Uniform Chain | Probability | medium |
| Is This Bet Favorable? | Probability | easy |
| Catalan Numbers and Balanced Parentheses | Probability | medium |
| Stars and Bars Distribution | Probability | easy |
| Poker Two Pair Probability | Probability | medium |
| Lattice Paths on a Grid | Probability | medium |
| Random Walk on a Cube | Probability | medium |
| Gambler's Ruin: Unfair Coin | Probability | medium |
| Absorbing Markov Chain Coin Game | Probability | medium |
| Drunkard on a Number Line | Probability | easy |
| Expected Random Chord Length | Probability | medium |
| Coin Landing on a Grid | Probability | easy |
| Random Points Form Obtuse Triangle | Probability | hard |
| Expected Range of Five Uniform Draws | Probability | medium |
| Distribution of Median of Three Uniforms | Probability | medium |
| Bayesian Urn Update | Probability | medium |
| Balls into Bins — Expected Empty Bins | Probability | medium |
| Sum of Two Uniform Random Variables | Probability | easy |
| Expected Maximum of Two Dice | Probability | easy |
| Reservation Wage Problem | Probability | medium |
| Chuck-a-Luck Expected Value | Probability | easy |
| Conditional Expectation of a Die | Probability | easy |
| Expected Absolute Difference of Two Dice | Probability | easy |
| Pick the Higher Card | Probability | medium |
| Poisson Process Arrivals | Probability | easy |
| Merging Poisson Processes | Probability | medium |
| Three Coins Majority Vote | Probability | easy |
| Expected Rolls Until a Repeat | Probability | medium |
| Dice Sum Given One Die is 3 | Probability | easy |
| Quality Control Sampling | Probability | medium |
| Expected Fixed Points in a Permutation | Probability | easy |
| Probability of a Flush | Probability | medium |
| Poisson No Arrivals in 30 Minutes | Probability | easy |
| Conditional Probability with Two Dice | Probability | easy |
| Expected Rolls Until Third Six | Probability | easy |
| Should You Pay to Redraw? | Probability | medium |
| Expected Runs in Coin Flips | Probability | medium |
| Expected Coin Flips to See THH | Probability | medium |
| Correlation Bounds from Pairwise Values | Probability | medium |
| Probability of a Run of 3 Heads in 6 Flips | Probability | medium |
| Birthday Twins in a Group | Probability | medium |
| Intersecting Random Chords | Probability | medium |
| Pass the Ball Around a Circle | Probability | medium |
| Chess Tournament Probability | Probability | medium |
| Extra Coin in the Bag | Probability | medium |
| At Least One Die Larger Than 4 | Probability | easy |
| Rolling a 4 Before a 2 | Probability | easy |
| Odd Roll Before Even on First Two Dice | Probability | easy |
| Comparing Coin Flips | Probability | medium |
| Fleeing Flea on a Number Line | Probability | medium |
| Dice in Strictly Increasing Order | Probability | medium |
| Collecting the Last Toy | Probability | medium |
| Tennis Deuce Probability | Probability | medium |
| Sum of Four Dice | Probability | easy |
| The 60-40 Split | Probability | easy |
| Random Dart on a Circular Target | Probability | medium |
| Basic Die Game | Probability | medium |
| Ten Dice Sum Exceeding 40 | Probability | medium |
| Random Sum via Tower Property | Probability | medium |
| Die-Then-Coins (Tower Property) | Probability | medium |
| Two-Stage Stick Breaking | Probability | medium |
| Nested Die Rolls (Tower Property) | Probability | hard |
| Uniform Maximum: Mean and Variance | Probability | easy |
| Minimum of Exponential Random Variables | Probability | easy |
| k-th Order Statistic of Uniforms | Probability | medium |
| Uniform Range: Mean and Variance | Probability | medium |
| Moving Ants II | Probability | easy |
| Guess The End | Probability | hard |
| Even Majority | Probability | easy |
| Expected Determinant | Probability | medium |
| Even Lattice Points | Probability | medium |
| No Rocks Allowed | Probability | easy |
| Sum Over One II | Probability | medium |
| Game Of Smaller Number | Probability | medium |
| Tic Tac Toe | Probability | easy |
| Circuit | Probability | medium |
| Double Value | Probability | easy |
| Random Tree Construction | Probability | medium |
| Tetrahedral Dice Game | Probability | medium |
| Unfair Rock Paper Scissors | Probability | medium |
| Bulbs In A Grid | Probability | medium |
| Circular Table I | Probability | medium |
| Place Or Take | Probability | medium |
| Optimal Die Choice | Probability | medium |
| Two Rolls Reward | Probability | easy |
| Dice Game VI | Probability | medium |
| Penguin Walk I | Probability | easy |
| Nearest Paint I | Probability | hard |
| Get King And Ace | Probability | medium |
| Choose Values III | Probability | medium |
| 10 Consecutive Heads | Probability | medium |
| Expected Good Points | Probability | medium |
| Min, Median, Max Guess | Probability | hard |
| Increasing Rolls Expectation | Probability | medium |
| Low Median | Probability | easy |
| Circle Fitting II | Probability | medium |
| To Infinity And Beyond II | Probability | medium |
| Jumping Frog IX | Probability | medium |
| Power Factor | Probability | easy |
| Forming Quadratic Polynomial II | Probability | medium |
| Ants On A Circle IV | Probability | hard |
| Probabilistic Strategy I | Probability | easy |
| Weighted Coins | Probability | medium |
| Conditional Normal III | Probability | easy |
| Ten-Dimensional Ball | Probability | medium |
| Random Point On Disc | Probability | easy |
| Coin Equalizer | Probability | medium |
| Distinct Faces | Probability | medium |
| Noodle Loop | Probability | hard |
| Maximising Heads I | Probability | easy |
| Jet Trail Intersection | Probability | medium |
| Expected Head-Tail Ratio | Probability | medium |
| Toss Exceedance | Probability | easy |
| Adding 1 Or 2 | Probability | medium |
| Power Distance I | Probability | medium |
| Interesting Average I | Probability | medium |