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Mathematics 9 Online
OpenStudy (anonymous):

Evaluate 6 C 2. 30 70 120 15

OpenStudy (anonymous):

what "C"?

OpenStudy (anonymous):

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

OpenStudy (anonymous):

that is the formula.

OpenStudy (anonymous):

your n=6 and r=2

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