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Math Help - Politics probability question

  1. #1
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    Politics probability question

    A senate committee consists of five Democrats and five Republicans. If four people from the committee are selected at random, what is the probability that all four are Democrats, given that at least one of them is a Democrat?

    The probability that all four are Democrats is?
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  2. #2
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    Re: Politics probability question

    you want to show some work for this one?
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