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set 25 q 29


 
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radhika1306
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PostPosted: Thu Sep 06, 2007 9:54 am    Post subject: set 25 q 29 Reply with quote
if X>1 and Y>1, is X<Y?
(1) X^2/(XY+X)<1
(2) XY/Y^2-Y<1
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kajcha
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PostPosted: Thu Sep 06, 2007 11:12 am    Post subject: Reply with quote
IMO Ans is B

Stmt 1
X^2/(XY+X) < 1 this can be written as

(XY+X)/X^2 > 1 => (Y+1)/X > 1 => Y+1 > X

means X=Y or Y>X

Stmt2
XY/(Y^2-Y) < 1 I assumed this is what you mean

(Y^2-Y)/XY > 1 => Y-1/X > 1 => Y-1 > X means Y>X
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radhika1306
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PostPosted: Tue Sep 11, 2007 10:41 am    Post subject: Reply with quote
correct thanks
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