Latest Book Aptitude Question SOLUTION: 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?

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(#M40021261) BOOK question Keep an EYE

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?

Asked In Book Abhishek (10 years ago)

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vaiyapuri  (4 years ago)

Number of ways in which one or more objects can be selected out of S1 a like
objects of one kind, S2 alike objects of second kind , S3 a like objects of third
kind and so on ... Sn alike objects of nth kind
= (S1 + 1) (S2 + 1)(S3 + 1)...(Sn + 1) - 1

There are 10 different books.
Each book has 20 copies and all the copies of each particular book can be
considered as identical.
Hence, required number of ways
=[(20+1)(20+1)⋯(10 times)]–1=[21×21×⋯(10 times)]–1=2110−1
so that the answer is 2110−12110−1

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