Asked by Steph

6. Combination of 9 pick 6

This seems easy but I am not sure how to set the problem up.

Thanks!
Answered by Steve
9!/3!6!
Answered by Reiny
C(9,6)
= 9!/(6!3!)
= 362880/(720 x 6)
= 84

you should have a C(n, r) key on you r calculator
sometimes shown as <sub>n</sub>C<sub>r</sub>
on mine it is found under the "5" key

so enter
9
<sub>n</sub>C<sub>r</sub>
6
=

to get 84
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