there are 10 different books and 20 copies
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I think the question needs to be completed... so the question will be the following and next
92. There are 10 different books and 20 copies of each book in a library. In how many ways can one or more than one book be selected?
Answer: Option A
Explanation:
Number of ways in which one or more objects can be selected out of S1 alike objects of one kind, S2 alike objects of second kind , S3 alike objects of third kind and so on ... Sn alike objects of nth kind
= (S1 + 1) (S2 + 1)(S3 + 1)...(Sn + 1) - 1
hope it helps
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