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Answer :

AlgebraicAardvarkgo

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.

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