Use some thinking to answer the following question. If x and y are unique prime integers, which of the following must be even?\nOptions:\n(A) x−y\n(B) x−2y\n(C) 2x−2y\n(D) 2x−y\n(E) xy^2
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Any number multiplied by 2 has to be an even number So the final answer is (C).
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