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Math Help - stuck on more probability

  1. #1
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    stuck on more probability

    Much appreciated in advance for guidance on this..

    A sample of 5 different calculators is randomly selected from a group containing 16 that are defective and 30 that have no defects.

    (a) What is the probability that 3 of the 5 calculators in the sample are defective?


    (b) What is the probability that at least one of the 5 calculators in the sample is defective?
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  2. #2
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    Quote Originally Posted by johnewton View Post
    A sample of 5 different calculators is randomly selected from a group containing 16 that are defective and 30 that have no defects.
    (b) What is the probability that at least one of the 5 calculators in the sample is defective?
    The probability that none of the five is defective is: \Large{ \frac{{30\choose 5}}{{46\choose 5}}}.
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