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A library has different books and 3 copies of each of the books. The number of ways of selecting one or more books from the library is
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a
4n−1
b
5n−1
c
2n−1
d
n3−1
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Correct option is A
For each book we have four choices. We can choose 0, 1, 2 or 3 volumes of the book.Similar Questions
is equal to
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