Thread: OT: Math help. Permutations and Combinations
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Old February 26th, 2007, 11:43 PM
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Default Re: OT: Math help. Permutations and Combinations
! = factorial.

For nice positive integers, you start with the number, and multiply it by all the numbers below it until you get to 1.

5! = 5x4x3x2x1 = 120

It gets uglier when you throw in negatives, or fractional numbers.
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