# Bad rendering of parentheses of binomial coefficient in Beamer

I am working with documentclass Beamer version 3.10 and I have a problem with the rendering of the parentheses of the binomial coefficient. Here the code:

\documentclass[aspectratio=169, 8pt]{beamer}
\usefonttheme{serif} %required for article-like displaying of math

\usepackage{amsmath,amssymb}

\begin{document}

\begin{frame}[plain,t]

$\dbinom{n}{k}$

\end{frame}

\end{document}


And this is the output:

The weird thing is that if I change the documentclass to article and comment the line \usefonttheme{serif}, then I get

which is the desired rendering. Any idea of how to correct the printing of the binomial coefficient in beamer? Why this strange behavior in Beamer?

Note: I have tried with \choose, with $\displaystyle \binom{n}{k}$ and putting the expression within an equation environment, but without success.

• Thanks to @StevenBSegletes and Svend Tveskaeg by their replies, all of their solutions work, I just add an additional question in my original post about why that behavior in Beamer. – Carlos Mendoza May 29 '14 at 11:02

\documentclass[aspectratio=169, 8pt]{beamer}
\usefonttheme{serif} %required for article-like displaying of math
\usepackage{amsmath,amssymb,scalerel}
\usepackage[usestackEOL]{stackengine}
\stackMath
\begin{document}
\begin{frame}[plain,t]

$\dbinom{n}{k}$  DBINOM

$\scaleleftright[1.7ex]{(}{\Centerstack{n\\k}}{)}$  SCALEREL + STACKENGINE

$\parenVectorstack{n\\k}$ JUST STACKENGINE

\end{frame}
\end{document}


If you don't have to use 8pt font size, 10pt does the trick:

\documentclass[10pt]{beamer}

\usefonttheme{serif}
\usepackage{amsmath,amssymb}

\begin{document}

\begin{frame}
$\dbinom{n}{k}$
\end{frame}

\end{document}


• With global font size of 8 pt and sorrounding the math expression with \large also works: {\large [\binom{n}{k}]} In any case I still do not understand why is all this necessary in Beamer. – Carlos Mendoza May 29 '14 at 12:38