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If \(x\) and \(y\) are positive integers, is \(xy\) even?
(1) \(x^2 + y^2 - 1\) is divisible by \(4.\)
(2) \(x + y\) is odd.
Answer: D
Source: Official Guide
(1) \(x^2 + y^2 - 1\) is divisible by \(4.\)
(2) \(x + y\) is odd.
Answer: D
Source: Official Guide
