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What does N and R stand for in permutations?

Permutation deals with the arrangement of objects or elements of a set in a particular order. The number of ways of arranging the objects or the number of permutations of n objects taken r number of objects at a time is given by:

nPr = n!/(n – r)!

Here, n represents the total number of objects or elements of the set and r represents the number of objects taken for permutations.

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