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There are n different books and m copies of each in a college library. The number of ways in which a selection of one or more books is : |
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Answer» Correct option (d) (m + 1)n − 1 Explanation: In the case of each book we may take 0, 1, 2, 3, ... m copies. ∴ We may deal with each book in (m + 1) ways and therefore with all the books in (m + 1) n ways. But this includes the case where all books are rejected and no selection is made. So, the number of ways in which selection can be made = (m + 1)n − 1 |
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