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HARD PS GMAT PREP

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HARD PS GMAT PREP [#permalink] New post 06 Aug 2006, 15:34
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 [#permalink] New post 06 Aug 2006, 18:06
Try plugging numbers x=1 and y=1 and you will see that only II is true

Another way is square all expressions and go from there. It also leads to II, but it could take longer, IMO
  [#permalink] 06 Aug 2006, 18:06
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