Mathematics, 06.10.2019 03:00, makaylahunt

Twenty different books are to be put on five book shelves, each of which holds at least twenty books.
(a) how many different arrangements are there if you only care about the number of books on the shelves (and not which book is where)?
(b) how many different arrangements are there if you care about which books are where, but the order of the books on the shelves doesn't matter?
(c) how many different arrangements are there if the order on the shelves does matter?

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Twenty different books are to be put on five book shelves, each of which holds at least twenty books...