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The number of different permutations

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A permutation is a particular sequence of a given set of objects.
The number of different permutations of n distinct objects taken r at a time is

P(n,r) = n! / (n-r)!

*** Âü°í¹®Çå[References] ***

NCEES, FUNDAMENTALS OF ENGINEERING SUPPLIED-REFERENCE HANDBOOK, 4th edition
P(n,r) = fac(n) / fac(n-r)
º¯¼ö¸í Variable º¯¼ö°ª Value º¯ ¼ö ¼³ ¸í Description of the variable


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