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Guides

Short, practical guides on luck and chance, with real numbers. Each one comes with a free tool to try what you just read.

How to Do Secret Santa: Rules, Budget and TipsRules, budget, couples and the mistakes to avoidHow to Pick a Random Winner FairlyMethods, traps and how to prove a drawing was fairDice Probability Explained: 1, 2 and 3 Dice, d20 and MoreWhy 7 comes up most, d20 advantage and moreIs a Coin Flip Really 50/50?The physics of a toss, streaks and the gambler's fallacyHow to Make Fair Teams: Random, Snake Draft or PotsRandom split, snake draft, pots by level, odd numbersLottery Odds Explained: How Your Chances Are CalculatedWhere the big numbers come from, prizes, myths