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January 31, 2015

January 31, 2015

Posted by **Jen** on Wednesday, July 27, 2011 at 9:49am.

- Math -
**Reiny**, Wednesday, July 27, 2011 at 10:07amThis would be an example of the C(n,r) that I explained in a few posts below.

You are choosing 9 from the 13, and the order really does not matter, so

C(13,9) = 13!/(9!4!) = 715

look for a key labeled_{n}C_{r}on your calculator

press

13

2ndF_{n}C_{r}

9

=

you should get 715

- Math -
**Jen**, Wednesday, July 27, 2011 at 12:25pmyea i was having a problem because the calculator i have doesnt have the F button, but thanks for helping me...it was very confusing to me...

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