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Posted by on Friday, February 28, 2014 at 4:43pm.

There are 7 different books on a shelf. How many selections of more than 4 books can be made?

  • Math 30-2 - , Friday, February 28, 2014 at 4:48pm

    7C4 + 7C5 + 7C6 + 7C7 = 64
    since

    n
    ∑ nCk = 2^n
    k=0

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