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Source: — Data Sufficiency |
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by neelgandham » Wed Nov 02, 2011 2:19 pm
1) X^2 + Y^2 > Z^2 => X^4 + Y^4 + 2(XY)^2 > Z^4 Insufficient !
2) X + Y > Z X+Y = 1 and Z = -6 ; X+Y = 10, Z = -6 both satisfy the inequation and give different results for X^4 + Y^4 Insufficient

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