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28. 집합 \( X = \{ 1, 2, 3, 4, 5, 6 \} \)에 λŒ€ν•˜μ—¬ λ‹€μŒ 쑰건을 λ§Œμ‘±μ‹œν‚€λŠ” ν•¨μˆ˜ \( f : X \to X \)의 κ°œμˆ˜λŠ”? [4점]

\[
\begin{aligned}
    &\text{(κ°€) } f(1) \times f(6) \text{의 값이 6의 μ•½μˆ˜μ΄λ‹€.} \\
    &\text{(λ‚˜) } 2f(1) \leq f(2) \leq f(3) \leq f(4) \leq f(5) \leq 2f(6)
\end{aligned}
\]

\begin{itemize}
    \item[1] 166
    \item[2] 171
    \item[3] 176
    \item[4] 181
    \item[5] 186
\end{itemize}