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17 September, 15:00

A bookcase contains 2 statistics books and 5 biology books. if 2 books are chosen at random, the chance that both are statistics books is

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  1. 17 September, 18:48
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    The answer is 1/15.

    number of ways to choose any 2 books out of 5 biology books = ⁵C₂ = 5! (2! x 3!) = 10

    number of ways to choose 2 statistic books out of 2 = ²C₂ = 1

    So, probability that both two books are statistics books = 1/10
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