Large Delimiters

Question

I am stuck with a LaTeX glitch! I am making an exercise on sequences and series. I have to write down an expression for the general form of a sequence for which I need large delimiters. I tried various ways but it did not work.

Here is a minimal example.

\documentclass[a4, 14pt]{extarticle}

\begin{document}

\begin{align}
 \[ \left{
       \frac{(-1)^{n}}{n}
    \right}_{n=1}^{\infty}
 \]
 \end{align}

\end{document}

I tried $$ .... $$, \[ ... \], and \begin{align} ... \end{align} but all returned errors on compiling. I don't know how to fix this!

Answer 1

You should type \left\{ and \right\} instead of \left{ and \right{, since { is a special symbol of TeX.