14.1 counting

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Permutation

Set of distinct objects in a specific order

P (n,r)

The number of permutations of n objects taken r at a time

Distinguishable

Two permutations are __________ if one cannot be obtained from the other by interchanging the positions of elements of the same kind

Combination

Any subset of r elements from a set, with no regard for order

C (n,r)

The number of combinations of n elements taken r at a time