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If x and y are positive, which of teh following must be

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Joined: 16 Nov 2007
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If x and y are positive, which of teh following must be [#permalink]  25 Nov 2007, 19:51
If x and y are positive, which of teh following must be greater than 1/ (x+y)^1/2

I. (x+y)^1/2 / 2x
II. x^1/2 + y^1/2 / x+y
III. x^1/2 - y^1/2 / x+y
CEO
Joined: 17 Nov 2007
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Concentration: Entrepreneurship, Other
Schools: Chicago (Booth) - Class of 2011
GMAT 1: 750 Q50 V40
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Does "x^1/2 + y^1/2 / x+y" mean "(x^1/2 + y^1/2) /( x+y)" or "x^1/2 + (y^1/2 / x+y)" or "x^1/2 + (y^1/2 / x)+y"?
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