equals_one.tex

\documentclass[11pt]{article}

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\usepackage{mathtools}

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\newenvironment{blockquote}{
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\title{Exam I Study Sheet}

\begin{document}

\begin{center}
    $ \sum\limits_{n=1}^\infty \frac{1}{2^n} = 1 $
\end{center}

\end{document}