Question 989393
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You need to determine the number of ways to choose 9 things taken 7 at at time.


*[tex \LARGE \ \ \ \ \ \ \ \ \ \  {{n}\choose{k}}\ =\ \frac{n!}{k!(n-k)!}]


You need


*[tex \LARGE \ \ \ \ \ \ \ \ \ \  {{9}\choose{7}}]


Your *[tex \Large \frac{9!}{7!}] was close, just off by a factor of 2.


John
*[tex \LARGE e^{i\pi}\ +\ 1\ =\ 0]
My calculator said it, I believe it, that settles it

*[tex \Large \ \
*[tex \LARGE \ \ \ \ \ \ \ \ \ \