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Q.

In a book-stall, there are 4 copies of one book, 5 copies of another and single copy of 5 other different books. Then the no. of ways that a person can purchase one or more books is

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a

340

b

535

c

959

d

1002

answer is C.

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Detailed Solution

The no. of ways that a person can purchase one or more books is =(4+1)(5+1)(25)−1=959
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