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Is x^4 + y^4 > z^4? 1. x^2 + y^2 > z^2 2. x + y > z

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Manager
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Joined: 15 Aug 2006
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Is x^4 + y^4 > z^4? 1. x^2 + y^2 > z^2 2. x + y > z [#permalink] New post 25 Nov 2006, 18:44
Is x^4 + y^4 > z^4?

1. x^2 + y^2 > z^2
2. x + y > z
Senior Manager
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 [#permalink] New post 25 Nov 2006, 21:06
some one already asked this some time ago...

answer is E.

x=y=3 z=4 is a counter example for both st1 and st2.
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 [#permalink] New post 26 Nov 2006, 17:15
Can anyone provide the link to the previous posting? Good question.
  [#permalink] 26 Nov 2006, 17:15
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Is x^4 + y^4 > z^4? 1. x^2 + y^2 > z^2 2. x + y > z

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