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Formula: nCr = n! divided by (n-r)! x r!

where n is the number of things to choose from and you choose r of them

15C4 = 15!divided by (15-4)! x 4! = 1365 ways

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โˆ™ 2012-07-03 16:15:29
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Q: How many combinations can be made using of fifteen thing taken four at a time?
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