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Difficulty—
Is the product \(abcd\) even?
(1) \(a^2+b^2+c^2+d^2=0\)
(2) \(a = b = c = d\)
Answer: A
Source: GMAT Club Tests
(1) \(a^2+b^2+c^2+d^2=0\)
(2) \(a = b = c = d\)
Answer: A
Source: GMAT Club Tests
