Undefined control sequence when using \therefore

Question

In my code I wrote :

 $\therefore$ There is a total of 21,168 ways that we can choose 2 chemists and 3 physicists. 

However, I am getting the undefined control sequence error. I have used packages amsfonts and amsmath, but that doesn't seem to fix the problem.

Thank you.

Answer 1

You need to load amssymb:

\documentclass{article}
\usepackage{amssymb}

\begin{document}

$\therefore$

\end{document}