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    chels_kep's Avatar
    chels_kep Posts: 1, Reputation: 1
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    #1

    Sep 27, 2010, 08:00 PM
    Probability
    An urn contains 4 red, 4 white, and 4 blue marbles. In how many ways can 3 red and 2 blue marble(s) be selected?
    Unknown008's Avatar
    Unknown008 Posts: 8,076, Reputation: 723
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    #2

    Sep 27, 2010, 11:48 PM

    I'm assuming that the total number of marbles to be picked is 5 and that you are looking for the probability that you pick 3 red and 2 blue marbles.

    The number of ways to pick the 3 red and 2 blue marbles can be found as follows:

    There are 5 marbles, of which 3 are red and 2 blue.

    Hence you have: number of ways of getting 3 red and 2 blue marbles.

    I think you can now proceed with the probability.

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