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+\begin{exercise}
+Solve: $\displaystyle\lim_{n\to\infty} \frac{2n}{3n+1}$
+\begin{solution}
+We have,
+\[
+ \lim_{n\to\infty} \frac{2n}{3n+1} = \frac{2}{3+\frac{1}{n}}=\fbox{$\displaystyle\frac23$}
+\]
+\end{solution}
+\end{exercise} \ No newline at end of file