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HMMT 2011 U31

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Let A={1,2,3,…,9}A=\{1,2,3, \ldots, 9\}. Find the number of bijective functions f:A→Af: A \rightarrow A for which there exists at least one i∈Ai \in A such that

∣f(i)−f−1(i)∣>1\left|f(i)-f^{-1}(i)\right|>1

Dataset text NuminaMath olympiads. Quoted with source.

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