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From the book, Chapter 2. Picking two friends from six for concert tickets: 15 pairs, so any one pair is 1 in 15; in order there are 30. A thief with three guesses at a four-digit PIN has 0.03% (1 in 3,333). Six numbers from 49: 13,983,816 tickets. Five people can sit in a row 120 ways, and a deck can be shuffled into 8.07 × 10⁶⁷ orders.
Exact arithmetic, worked the way the book shows. Everything stays in your browser: no sign-up, nothing stored or sent.