Friday, July 11, 2008

Theorems - Permutations and Combinations

1. n! = n[9n-1)!]

2. I fone thing can be done in m ways and after it has been done by anyone of these m ways, another thing cna be done in n ways, independent of the ways of dong the first thing, then the total number of ways doing the two things together is mn.

(Chapter : permutations and combinations)

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