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25. μμ΄ $\{a_n\}$μ λνμ¬ $\lim_{n \to \infty} \frac{n a_n}{n^2 + 3} = 1$ μΌ λ, \[ \lim_{n \to \infty} \left( \sqrt{a_n^2 + n} - a_n \right) \text{μ κ°μ?} \ [3 \text{μ }] \] \begin{itemize} \item[1] $\frac{1}{3}$ \item[2] $\frac{1}{2}$ \item[3] $1$ \item[4] $2$ \item[5] $3$ \end{itemize} |