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which one is true

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by mehrasa » Sun Sep 18, 2011 11:33 pm
if d>0 and 0<1-c/d<1 which one must be true?
I) c>0
II) c/d<1
III) c^2+ d^2>1

my Q is that how we can chk the third choice mathematically without picking No.
Last edited by mehrasa on Mon Sep 19, 2011 2:29 am, edited 1 time in total.
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by gmatclubmember » Mon Sep 19, 2011 1:18 am
mehrasa wrote:if d>0 and 0<1-c/d<0 which one must be true?
I) c>0
II) c/d<1
III) c^2+ d^2>1

my Q is that how we can chk the third choice mathematically without picking No.
Please post the correct question since the second inequality seems to be incorrect. 0<x<0 ???

Cheers
Ami/-
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by mehrasa » Mon Sep 19, 2011 2:08 am
hey Ami
I can not see anything wrong here to correct..this is the exact question...
Last edited by mehrasa on Mon Sep 19, 2011 2:29 am, edited 1 time in total.
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by excavator » Mon Sep 19, 2011 2:10 am
Hi..

How is it possible 0<1-c/d<0.
Could you please rectify
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by GMATGuruNY » Mon Sep 19, 2011 2:39 am
I posted a solution here:

https://www.beatthegmat.com/official-gma ... 85301.html

Algebra is often the most efficient way to prove that a statement MUST be true.
To prove that a statement DOESN'T have to be true, picking numbers is usually faster. All you need is ONE combination of numbers for which the statement is not true.
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