KoreanSAT / data /json /2025 /math_18.txt
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18. μˆ˜μ—΄ $\{a_n\}$이 λͺ¨λ“  μžμ—°μˆ˜ $n$에 λŒ€ν•˜μ—¬
\[
a_n + a_{n+4} = 12
\]
λ₯Ό λ§Œμ‘±μ‹œν‚¬ λ•Œ, $\sum_{n=1}^{16} a_n$의 값을 κ΅¬ν•˜μ‹œμ˜€. [3점]