Is the product \(abcd\) even?

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Is the product \(abcd\) even?

by Vincen » Thu May 13, 2021 6:14 am

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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