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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?

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

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User Yuriy Zaletskyy
by
8.7k points

2 Answers

4 votes

20\cdot19\cdot\ldots\cdot7\cdot6=20,274,183,401,472,000
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User Intraector
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8.3k points
1 vote

Answer: 20!/5!

Explanation:

answered
User Aleadam
by
8.5k points
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