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Type the formula for the number of permutations of n things taken r at a time.

User Petia
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2 Answers

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(n!)/(n-r!) is the formula

User Chris Weber
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5 votes

Answer:
(n!)/((n-r)!)

Explanation:

  • Permutation is a way of arranging the elements of a set into a order or a sequence . Here order matters.

The number of permutations of n things taken r at a time is given by the following formula:


^nP_r=(n!)/((n-r)!)

Therefore, the formula for the number of permutations of n things taken r at a time is
(n!)/((n-r)!)

User Carvell Fenton
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