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Leni [432]
2 years ago
9

A professor has 7 books they are trying to arrange on a shelf. If the professor selects 3 books at a time, how many different ar

rangements of books can they come up with?
i got 210 but im not sure
Mathematics
1 answer:
nlexa [21]2 years ago
7 0

<em>The number of </em><em>different arrangements </em><em>of books is 210</em>

What is the formula for Permutation?

Permutation in mathematics can be calculated by using the formula

nPr = \frac{n!}{(n - r)!}

where

  • nPr = Permutation required
  • n = total number of objects = 7
  • r = number of objects selected = 3

nPr = \frac{7!}{(7-3)!}

nPr = \frac{5040}{24}

nPr = 210

Therefore, the required number of ways is 210

learn more about permutations here brainly.com/question/112112

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