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Combinatory numbers?

Latex tip for Mr.Math : \(\binom{n}{r} \)

or even
\[\dbinom{n}{k}\]

OR even \( n \choose r \)

Your need more keystrokes :P

Oh I got it. Thanks :-)

\[n\choose r\]

@SqueeSpleen: If you could write it in latex, that would be great!

I made some mistakes, I'll start from zero, and I may use latex.

Okay.

Shouldn't it be \( \dbinom{n}{2} = \large\frac{n(n-1)}{2} \)

I like your dedication! 17 hours and you still wanna solve it! excellent!