Permutations
Counts arrangements of n items: n! or n!/(n-k)! when choosing k items.
P(n,k)
60
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Formula
P(n, k) = n! / (n − k)!
Example: P(5, 3) = 60
Methodology
Arrangements of n items: n!. Choosing k from n: n!/(n−k)!.
Example
5! = 120. P(5,3) = 60.