Mathematics, 30.10.2019 01:31 griseldaguerree

How many ways can a librarian arrange 15 books on a top shelf if she has 20 books from which to pick?
20! /5!
20! /15!
15! /5!

Answers: 1

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How many ways can a librarian arrange 15 books on a top shelf if she has 20 books from which to pick...