How to display binomial coefficient in LaTeX document?

In this tutorial, we will cover the binomial coefficient in three ways using LaTeX.

First, I will use the \binom command and with it the \dbinom command for text mode.

\documentclass{article}
\usepackage{amsmath}
\begin{document}
   $$ \binom{n}{k}=\frac{n!}{k!(n-k)!} $$
   $$ \dbinom{8}{5}=\frac{8!}{5!(8-5)!} $$
   % Use \tbinom command for text mode
   $$ \tbinom{n}{k} $$
\end{document}

Output :

Binimial coefficient using amsmath package.

Second, I will use {n\choose k} syntax to represent this symbol. You can use this syntax instead of using the \binom command. In both cases, you will return the same output.

\documentclass{article}
\newcommand{\binomial}[2]{{#1\choose #2}}
\begin{document}
   $$ {n\choose k}=\frac{n!}{k!(n-k)!}$$
   % Use \newcommand for binomial coefficent
   $$ \binomial{n}{k},\binomial{n^\prime}{k^\prime} $$
   $$ \binomial{p}{q}=\frac{p!}{q!(p-q)!} $$ 
\end{document}

Output :

Binomial coefficient using \choose command.

Use \genfrac command for binomial coefficient in LaTeX

amsmath package contains an interesting command. In the first two arguments, you have to use left and right parentheses. And lastly, two arguments of binomial coefficient have to be used.

\documentclass{article}
\usepackage{amsmath}
\newcommand{\binomial}[2]{\genfrac{(}{)}{0pt}{}{#1}{#2}}
\begin{document}
   $$ \genfrac{(}{)}{0pt}{}{n}{k}=\frac{n!}{k!(n-k)!} $$
   % Use \newcommand for easy to write
   $$ \binomial{a}{b},\binomial{p}{q} $$
\end{document}

Output :

Binomial coefficient using \genfrac command.

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