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From the book, Chapter 6. A 1-in-10,000-a-day coincidence: for one person it’s 3.6% over a year (1 in 28), and an even chance takes 19 years. In a town of 20,000 it happens about 2 times a day, 730 a year.
Exact arithmetic, worked the way the book shows. Everything stays in your browser: no sign-up, nothing stored or sent.