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25. If x is an integer, is an integer?( x2− y2 = 0( x2 − k2 = −y2 ... ...

If x is an integer, is image an integer?

(1) x2− y2 = 0

(2) x2 − k4 = −y2 for some positive integer k.


(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 Nova Press: Set C - More Practice

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