Bob J.

asked • 06/02/17

How many ways could you arrange 8 books on a shelf?

Do you use Permutation or Combination?

1 Expert Answer

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Michael A. answered • 06/02/17

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Permutation. There are 8! = 8 x 7 x 6 x 5 x 4 x 3 x 2 x 1 = 40,320 ways to arrange 8 books on a shelf
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Bob J.

Thanks. But can I write it like this...
 
8P8= 40320
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06/02/17

Michael A.

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Well, let's think about what that would say.
 
8P8 = 8!/(8 - 8)! = 8!/0!
 
Since 0! = 1, we have 8!/1 = 8!
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06/02/17

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