A library has n different books and 3 copies of each of the n  books. The number of ways of selecting one or more books from the library is

A library has n different books and 3 copies of each of the n  books. The number of ways of selecting one or more books from the library is

  1. A

    4n1

  2. B

    5n1

  3. C

    2n1

  4. D

    n31

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    Solution:

    For each book we have four choices. We can choose 0, 1, 2 or 3 volumes of the book.

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