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For non-zero integers, \(a, b, c\) and \(d,\) is \(\dfrac{ab}{cd}\) positive?

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For non-zero integers, \(a, b, c\) and \(d,\) is \(\dfrac{ab}{cd}\) positive?

by Vincen » Fri Feb 19, 2021 4:02 am

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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
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