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25. μˆ˜μ—΄ $\{a_n\}$에 λŒ€ν•˜μ—¬ $\lim_{n \to \infty} \frac{n a_n}{n^2 + 3} = 1$ 일 λ•Œ, 
\[
\lim_{n \to \infty} \left( \sqrt{a_n^2 + n} - a_n \right) \text{의 값은?} \ [3 \text{점}]
\]

\begin{itemize}
    \item[1] $\frac{1}{3}$
    \item[2] $\frac{1}{2}$
    \item[3] $1$
    \item[4] $2$
    \item[5] $3$
\end{itemize}