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UZ-MO 2012 Problem 1

    Given a digits { 0,1,2,...,90,1,2,...,9 } . Find the number of numbers of 6 digits which cantain 77 or 77 's digit and they is permulated(For example 137456 and 314756 is one numbers).

    Dataset text AI-MO AoPS. Quoted with source.

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