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HMMT November 2016 E8

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Let S={1,2,…2016}S=\{1,2, \ldots 2016\}, and let ff be a randomly chosen bijection from SS to itself. Let nn be the smallest positive integer such that f(n)(1)=1f^{(n)}(1)=1, where f(i)(x)=f(f(i−1)(x))f^{(i)}(x)=f\left(f^{(i-1)}(x)\right). What is the expected value of nn ?

Dataset text NuminaMath olympiads. Quoted with source.

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\frac{2017}{2}

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