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25 July, 11:09

A bag contains 5 red poker chips, 3 blue poker chips and 7 white poker chips. Two chips are drawn without replacement. Find the probability that the first and second are red.

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  1. 25 July, 12:12
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    5 red, 3 blue, 7 white ... total of 15

    probability of 1st drawn being red : 5/15 reduces to 1/3

    without replacement

    probability of 2nd being red : 4/14 reduces to 2/7

    probability of both : 1/3 * 2/7 = 2/21 <==
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