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Math Help - probability

  1. #1
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    Question probability

    a bag contains 8 white counters and 3 black counters. 2 counters are drawn, one after the other. find the probability of picking 1 white counter and 1 black counter if the 1st counter is
    a) replaced

    b) not replaced
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  2. #2
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    Quote Originally Posted by si55ler View Post
    a bag contains 8 white counters and 3 black counters. 2 counters are drawn, one after the other. find the probability of picking 1 white counter and 1 black counter if the 1st counter is
    a) replaced

    b) not replaced
    a).You have 11 counters in all. The probability of choosing a white on the first draw is 8/11.
    If you put it back, the probability of then picking a black is 3/11.

    b). The probability of choosing a white from the bag on the first draw is 8/11.
    If you don't replace it, that leaves 10 counters left in the sack.
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