To fix this, simply add a pair of braces around the whole binomial coefficient, i.e. However, as you're using LaTeX, it is better to use \binom from amsmath, i.e.

You can tap into amsmath 's \genfrac: enter image description here \ documentclass{article} \usepackage{amsmath}.

Binomial coefficients are common elements in mathematical expressions, the command to display them in LaTeX is very.