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There are n books having p copies of ea...

There are n books having p copies of each . The number of ways in which a selection can be made from them is :

Text Solution

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Since, copies of the same book are identical.
`therefore`Number of selections of any number of copies of a book is p+1. similarly, in the case for each book.
Therefore, total number of selction is `(p+1)^(n)`.
But this includes a selection, which is empty i.e., zero copy of each book. exluding this, the required number of non-empty selections is `(p+1)^(n)-1`.
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