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OpenStudy (anonymous):
How many quadrilaterals in 9 dots?
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OpenStudy (anonymous):
I think 126
OpenStudy (anonymous):
yep
Parth (parthkohli):
\[\binom{9}{4}\]
OpenStudy (anonymous):
Are you sure?
OpenStudy (anonymous):
@ParthKohli I don't know what that means.
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Parth (parthkohli):
That is 9 choose 4, or 9C4.\[= \frac{9!}{4! (9-4)!}\]
OpenStudy (anonymous):
So it turns out I am right:)
OpenStudy (anonymous):
everyone has medals :)
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