Permutation - Theorem -1 with Proof and Example | Mathematics Class 12

Mathematics | Notes

Permutation Theorem - 1

Class : 12

Permutation is the arrangement of objects with respect to some order. The permutation on n objects taken r at a time is denoted by P(n, r) or nPr.

Theorem-1

The total no of permutation of a set of n objects taken r at a time is given by:

P(n, r) = n.(n – 1).(n – 2).(n – 3) ………….. (n – r + 1)

[OR]

P(n, r) = n!/(n – r)! [where : ! is sign for factorial]

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