[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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