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and equate it to 3/5.

and since n is a whole number, only possible answer is
\[n=6\]

wait, sorry, I don't get why n(n - 1)/2

oh ok lets go slower

\[\dbinom{n}{2}=\frac{n!}{2!(n-2)!}\] ok?

ohhh. so if it was the coefficient of x^3, then we would do n(n - 1)(n - 3)/3 ??

it would be
\[\frac{n(n-1)(n-2)}{3!}\]

don't forget the factorial in the denominator

^sorry, that's what I meant to type :P Got it.

great!

So, what's up, satellite??? haven't been here in a while :P

not much. where you been?

Sitting at home, studying for my mocks -_-. Ohhh, and i've got braces. i look WEIRD.

been a month it seems

ouch. did they hurt?

But i've got a pretty blue, AND it's only for a year, so it's cool.

well at least they are a color and not those awful railroad tracks!

What cheapsters.

See??/ i'm such a nice girl, I became your fan :P