THE COMPLETE ARCHIVE9 puzzles · no spoilers
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2 puzzles · Bayesian reasoning
Clear filtersOne green ball changes the odds
A bag contains 10 balls. Its number of green balls K is chosen uniformly from 0 through 10; the rest are red. You draw a ball uniformly, see green, and set it aside.
Bayesian reasoningMedium
The coin with two heads
Choose uniformly among a fair coin, a two-headed coin, and a two-tailed coin. Flip it once and observe heads.
Bayesian reasoningEasy