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9 November, 17:17

Suppose that three fair coins are flipped independently. what is the probability that exactly two of them come up heads?

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  1. 9 November, 17:35
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    The probability of the first 2 being heads and the next one being a tail

    = (1/2) ^3 = 1/8

    2 heads and 1 tail can happen in 3 different ways:-

    HHT HTH THH

    So probability of 2 H and 1 T = 3 * 1/8 = 3/8 Answer
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