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Math Help - [SOLVED] Probability with Marbles

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    [SOLVED] Probability with Marbles

    There are 4 red, 2 white, and 4 blue marbles in an urn. Two marbles are selected at random without replacement. What is the probability that neither is red, given that neither is white?

    I said it was 2/5ths since there are 10 marbles in all, you don't want them red OR white, which leaves you with the 4 blue marbles.

    4/10 = 2/5

    However this seems to be the wrong answer. Would someone mind explaining what I did wrong?

    Thanks.

    EDIT: SOLVED IT. I didn't factor in that white was the given.
    Last edited by Sakurazaki; October 22nd 2009 at 06:37 PM.
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