Question

What is the formula for permutation combination ?

Answer 1

One could say that a permutation is an ordered combination. The number of permutations of n objects taken r at a time is determined by thefollowing formula: P ( n , r ) = n ( n − r )

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Answer 2

Answer:

Formula for permutation -

nPr = n!/(n-r)!

where n = number of objects

r = number of places

Formula for combination -

nCr = n!/(n-r)!r!