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

Mary purchased a package of 13 different plants, but she only needed 9 plants for planting. In how many ways can she select the 9 plants from the package to be planted?

- Math -
**Reiny**, Wednesday, July 27, 2011 at 10:07am
This 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 12:25pm
yea 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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