Find different arrangements about number of books on shelves


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

i) How many different arrangements are present if you only care about number of books on shelves?

ii) How many different arrangements are present if you care about which books are present, but order of books on shelves does not matter?

iii) How many different arrangements are present if order on shelves matters?

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Mathematics: Find different arrangements about number of books on shelves
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