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mlane25269
- Master | Next Rank: 500 Posts
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- Joined: Fri Jun 13, 2008 7:31 am
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Hey mlane,
Often in GMAT difficult things are easier than they appear.
Let xy=t
(1) t^2+2t+1=0, using the quadratic formula, we get t=xy=-1, so SUFF
(2) we get nothing at all, so INSUFF
