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Source: — Data Sufficiency |
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by pepeprepa » Tue Sep 02, 2008 1:35 am
(2)
They tell you that
lal + lbl > la+bl

With a=2 and b=3 the inequality is wrong.
With a=-2 and b=-3 the inequality is wrong.
The only possibility is that a and b have opposite signs so as to put down la+bl
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