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

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VJesus12: Legendary Member; Posts: 2276; Joined: Sat Oct 14, 2017 6:10 am; Followed by:3 members

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

by VJesus12 » Wed Aug 26, 2020 3:41 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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Source: Beat The GMAT — Data Sufficiency | Wed Aug 26, 2020 3:41 am

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