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20 October, 12:55

An urn contains 7 red marbles and 3 white marbles. three marbles are drawn from the urn one after the other. find the probability that the first two are red and the third is white.

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  1. 20 October, 13:46
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    7+3 = 10 total marbles

    1st pick = 7/10 for a red one

    2nd pick = 6/9 reduces to 2/3 for a red one

    3rd pick = 3/8 for a white one

    7/10 x 2/3 = 14/30 reduces to 7/15

    7/15 x 3/8 = 21/120 reduces to 7/40

    probability = 7/40
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