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4 November, 18:07

A bad contains 8 black, 3red and 9 white balls. If 3 balls are drawn at random, find the probability that none is red

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  1. 4 November, 19:42
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    Argument

    You have a total of 8 + 9 + 3 balls = 20

    The first ball is 17/20 Probability that no ball drawn is red the first time

    The Second ball is 16/19 Probability that no ball drawn is red the 2nd time

    The third ball is 15/18 Probability that no ball drawn is red the 3rd time

    Answer

    Total Probability = 17/20 * 16/19 * 15/18 = 34/57

    My calculator figures out fractions. You can do this just as easily with decimals.

    0.85 * 0.8421 * 0.8333333 = 0.5964

    34/57 = 0.5965 which is close enough.

    If you have choices, choose the one that coincides with my answer. Otherwise use the decimal value.
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