Von Neumann's trick: how to get a fair flip from an unfair coin
doodlestein · x · 2026-10-15
doodlestein released a new video explaining John von Neumann's classic trick: even with a known-biased coin, you can get a perfectly fair flip by tossing twice — HT counts heads, TH counts tails, and doubles are re-tossed. The two outcomes are equiprobable regardless of the coin's bias.
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