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    from math import comb

    total_ways = comb(9, 1) * comb(10, 2)

    ways_case_A = comb(4, 1) * comb(7, 2)

    ways_case_B = comb(5, 1) * comb(7, 1) * comb(3, 1)

    successful_ways = ways_case_A + ways_case_B

    from fractions import Fraction probability = Fraction(successful_ways, total_ways)

    print(probability)