Posted by Rena on Tuesday, February 8, 2011 at 11:31pm.
Combinations = n!/r!(n-r)!
where n is the number of things to choose from, and you choose r of them
(No repetition, order doesn't matter)
5 factorial = 5! = 5 * 4 * 3 * 2 * 1 = 120
I'll let you do the calculations.
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