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21 December, 08:07

A box contains 10 purple marbles, 11 green marbles and 7 yellow marbles. if you pick two without looking, what is the probability that one will be green and the other will be yellow

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  1. 21 December, 08:15
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    Use combination

    probability = (11C1 + 7C1) / 28C2

    probability = (11+7) / 378

    probability = 18/378

    probability = 1/21
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