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6 September, 14:57

What is the probability of getting two heads and two tails in four flips of a fair coin?

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  1. 6 September, 17:17
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    Number of combinations possible = 4! / 2! 2! = 6

    Each of these has probability 1/2*1/2*1/2*1/2 = 1/16

    Required probability = 6 * 1/16 = 3/8
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