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    alexgintom's Avatar
    alexgintom Posts: 2, Reputation: 1
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    #1

    Apr 28, 2012, 11:48 AM
    Homework help
    Find the probability of selecting four purple balls at random out of ten balls, six of which are purple?
    stefaneli's Avatar
    stefaneli Posts: 6, Reputation: 1
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    #2

    Apr 29, 2012, 01:56 AM
    If the first blind pick is a purple ball then this has a probability of 6/10. If the second blind pick is purple ball then this has a probability of 5/9. If the third blind pick is another purple ball then this has a probability of 4/8. And the probability of 3/7 is the case of drawing fourth purple ball. The probability of the four purple balls being drawn is then 6/10*5/9*4/8*3/7 = 0.0714... I think that's the answer.

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