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Problem Solving — algebra and arithmetic (GMAT Focus Edition)
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Source: — Quantitative Reasoning |
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by Tani » Tue Jan 25, 2011 11:28 am
The second clue is useless. It simply tells us that the variable squared is positive, but all squares (except 0) are positive. So all we know is that w isn't zero.

The first clue doesn't help either. W could be 500 or -1.
Tani Wolff
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