# [texhax] \binom

Tim McKenzie tjm1983 at gmail.com
Sun Mar 1 22:40:34 CET 2009

On Monday 02 March 2009 08:25:28 P. R. Stanley wrote:
> Hi
> What does it do? What do you get when you compile \$\binom{3}{4}\$ in a
> document? Thanks
> Paul

It sets a 3 above a 4 and encloses them both in a single pair of sufficiently
tall parentheses. The 3 and the 4 are the same size as each other. You
probably already know what it denotes, but just in case you don't, here's one
way to describe it: \$\binom{n}{r}\$ denotes the coefficient of \$x^r y^{n-r}\$ in
the expansion of \$(x + y)^n\$.

Tim
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