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4red, 5 green, 6 white marbles in a bag. What is the probability that at least two are chosen to get 1 white?

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4red, 5 green, 6 white marbles in a bag. What is the probability that at least two are chosen to get 1 white?

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  1. Think of the opposite case.  What's the probability that only *one* marble is required to get a white?  That would be 6/15 = 2/5.

    So the probability that you require more than 1 draw is:

    1 - 2/5 = 3/5

    Answer:

    3/5

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