Mathematics, 12.07.2019 15:00, foralways4871

You find 20 books that you checked out from the library as you are cleaning your room. you need to take 4 books back to the library, and you want to set them aside in a pile on your desk. how many ways can 4 of the 20 books be arranged in a pile?

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You find 20 books that you checked out from the library as you are cleaning your room. you need to t...