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25. ๋ฑ๋น์์ด $\{a_n\}$์ ๋ํ์ฌ \[ \lim_{n \to \infty} \frac{a_{n}+1}{3^n + 2^{2n-1}} = 3 \] ์ผ ๋, $a_2$์ ๊ฐ์? [3์ ] \begin{itemize} \item[1] 16 \item[2] 18 \item[3] 20 \item[4] 22 \item[5] 24 \end{itemize}