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For non-zero integers, \(a, b, c\) and \(d,\) is \(\dfrac{ab}{cd}\) positive?
(1) \(ad + bc = 0\)
(2) \(abcd = -4\)
Answer: D
Source: Manhattan GMAT
(1) \(ad + bc = 0\)
(2) \(abcd = -4\)
Answer: D
Source: Manhattan GMAT
