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28. μ§ν© \( X = \{ 1, 2, 3, 4, 5, 6 \} \)μ λνμ¬ λ€μ 쑰건μ λ§μ‘±μν€λ ν¨μ \( f : X \to X \)μ κ°μλ? [4μ ] \[ \begin{aligned} &\text{(κ°) } f(1) \times f(6) \text{μ κ°μ΄ 6μ μ½μμ΄λ€.} \\ &\text{(λ) } 2f(1) \leq f(2) \leq f(3) \leq f(4) \leq f(5) \leq 2f(6) \end{aligned} \] \begin{itemize} \item[1] 166 \item[2] 171 \item[3] 176 \item[4] 181 \item[5] 186 \end{itemize} |