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25. ๋“ฑ๋น„์ˆ˜์—ด $\{a_n\}$์— ๋Œ€ํ•˜์—ฌ 
\[
\lim_{n \to \infty} \frac{a_{n}+1}{3^n + 2^{2n-1}} = 3
\]
์ผ ๋•Œ, $a_2$์˜ ๊ฐ’์€? [3์ ]

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