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If x and y are positive integers, is 2xy an integer? ( y – x = 0( xy ... ...

If x and y are positive integers, is √2xy an integer?
(1) y – x = 0
(2) xy = 1 for some positive integer y.


(A) if statement (1) ALONE is sufficient to answer the question but statement (2) alone is not sufficient;
(B) ...
(C) ...
(D) ...
(E) ...

*This question is included in Exercise Set A with Video Solutions

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