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March 4, 2015

March 4, 2015

Posted by **Anonymous** on Sunday, February 27, 2011 at 2:11pm.

- math -
**PsyDAG**, Monday, February 28, 2011 at 11:06amn = # of things to choose from and r = # that you choose.

5! = 5 factorial = 5*4*3*2*1 = 120

nCr = n!/r!(n-r)!

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