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AIME 2018b Problem 11

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Find the number of permutations of 1,2,3,4,5,61, 2, 3, 4, 5, 6 such that for each kk with 11 ≤\leq kk ≤\leq 55, at least one of the first kk terms of the permutation is greater than kk.

Dataset text AIME 1983 to 2026. Quoted with source.

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461

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