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3. ์ฒซ์งธํญ๊ณผ ๊ณต๋น๊ฐ ๋ชจ๋ ์์ \(k\)์ธ ๋ฑ๋น์์ด \(\{a_n\}\)์ด \[ \frac{a_4}{a_2} + \frac{a_2}{a_1} = 30 \] ์ ๋ง์กฑ์ํฌ ๋, \(k\)์ ๊ฐ์? [3์ ] \begin{itemize} \item[1] \(1\) \item[2] \(2\) \item[3] \(3\) \item[4] \(4\) \item[5] \(5\) \end{itemize} |