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2 April, 11:24

You have one fair coin, and one biased coin which lands heads with probability 3/4. you pick one of the coins at random and flip it three times. it lands heads all three times. given this information, what is the probability that the coin you picked is the fair one

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  1. 2 April, 14:17
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    The probability is

    [ (1/2) (1/2) ^3] / [ (1/2) (1/2) ^3 + (1/2) (3/4) ^3]
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