HMMT November 2010 F7
- General 2
- Answer
George has two coins, one of which is fair and the other of which always comes up heads. Jacob takes one of them at random and flips it twice. Given that it came up heads both times, what is the probability that it is the coin that always comes up heads?
Dataset text NuminaMath olympiads. Quoted with source.
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\frac{4}{5}
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