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3. ์ฒซ์งธํ•ญ๊ณผ ๊ณต๋น„๊ฐ€ ๋ชจ๋‘ ์–‘์ˆ˜ \(k\)์ธ ๋“ฑ๋น„์ˆ˜์—ด \(\{a_n\}\)์ด 

\[
\frac{a_4}{a_2} + \frac{a_2}{a_1} = 30
\]

์„ ๋งŒ์กฑ์‹œํ‚ฌ ๋•Œ, \(k\)์˜ ๊ฐ’์€? [3์ ]

\begin{itemize}
    \item[1] \(1\)
    \item[2] \(2\)
    \item[3] \(3\)
    \item[4] \(4\)
    \item[5] \(5\)
\end{itemize}