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A U B would "the set of numbers that are either factors of 15 OR prime numbers less than 10 OR both"
A = { 1, 3, 5, 15}
B = {2, 5, 7 }
A U B = { 1, 2, 3, 5, 7, 15 }
Of your choices, the answer would be C,
even though it is missing a factor of 15.