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postive and negative integers

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by Brent@GMATPrepNow » Sat May 02, 2009 1:32 pm
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Please note that this is not an official GMAT question; it’s my attempt to create mid-range (500 to 650-level) GMAT-style questions for this forum.
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by dumb.doofus » Sat May 02, 2009 2:16 pm
Answer is III only.. i.e. C

According to the original equation: either x or z is less than 0 but not both. About y we dont know if it is less than or greater than 0. Because its exponent is even, it is not changing the sign of the equation. So we can't be sure about y

but xz has to be definitely less than 0 because either x or z is less than 0
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by Brent@GMATPrepNow » Sat May 02, 2009 2:24 pm
Nice work; C it is
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