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3. ๋ฑ์ฐจ์์ด $\{a_n\}$์ ๋ํ์ฌ \[ a_2 = 6, \quad a_4 + a_6 = 36 \] ์ผ ๋, $a_{10}$์ ๊ฐ์? [3์ ] \begin{itemize} \item[1] 30 \item[2] 32 \item[3] 34 \item[4] 36 \item[5] 38 \end{itemize}