olymmath

HMMT November 2010 U20

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Given a permutation π\pi of the set {1,2,…,10}\{1,2, \ldots, 10\}, define a rotated cycle as a set of three integers i,j,ki, j, k such that i<j<ki<j<k and π(j)<π(k)<π(i)\pi(j)<\pi(k)<\pi(i). What is the total number of rotated cycles over all permutations π\pi of the set {1,2,…,10}\{1,2, \ldots, 10\} ?

Dataset text NuminaMath olympiads. Quoted with source.

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72576000

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