Answer
$0$
Work Step by Step
We have
$$
\lim _{n \rightarrow \infty} \frac{a_n+n}{a_n+n^2}= \lim _{n \rightarrow \infty}\frac{(a_n/n^2)+(1/n^2)}{(a_n/n^2)+1}\\
=\frac{0+0}{0+1}=0.
$$
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