Permutation and combination

Submitted by pradipta pramanik on Sat, 02/26/2011 - 17:06

Permutation and combination : Permutation of n different things taken r at a time (r≤n). Permutation of n things not all different. Permutation with repetitions (circular permutation excluded).
Combinations of n different things taken r at a time (r≤n). Combination of n things not all different.
Basic properties.
Problems involving both permutations and combinations.

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