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Posted by on Saturday, February 12, 2011 at 6:37am.

How many ways can a person select four books, two CDs, and one DVD from ten books, twenty CDs, and five DVDs?

  • math - , Saturday, February 12, 2011 at 9:05am

    To handle this type of question, my must be familiar with the C(n,r) notation.
    The person can select the books in C(10,4) or 210 ways
    the CD's in C(20,2) or 190 ways
    and the DVD's in C(5,1) or 5 ways.

    So the number of ways to make the selection is
    210*190*5 ways or 199500 ways.

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