dylanatkinson2 dylanatkinson2

20-06-2017
Mathematics

contestada

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!

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jimthompson5910 jimthompson5910

20-06-2017

Use the permutation formula
nPr = (n!)/((n-r)!)
20P15 = (20!)/((20-15)!)
20P15 = (20!)/(5!)

The final answer is choice A

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ashleybokros ashleybokros

10-07-2018

The correct answer is A turned this in got a 100 hoped this helped ya.

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