My code
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\documentclass[11pt]{article}
\usepackage{amsmath}
\usepackage{amssymb}
\usepackage[a4paper,body={},top=1.5cm, left=2.5cm,right=1cm,bottom=2.5cm,nohead]{geometry}
%=============== Begin Document ==================
\begin{document}
\begin{enumerate}
\item Question \#1\\
{\bf Answer.}
2-2.7+2.7^2-...+2(-7)^n=$\frac{1-(-7)^n+1}{4}
\end{enumerate}
\end{document}
Code: Select all
2-2.7+2.7^2-...+2(-7)^n=$\frac{1-(-7)^n+1}{4}