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500 DS

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Re: 500 DS

by Prasanna » Sun Apr 01, 2007 5:10 pm
dunkin77 wrote:Hi,

The answer is D but I thought the answer was B because 1) dose not say if Y and S are positive....


Is x – y > r – s?
(1) x > r and y < s?
(2) y = 2, s = 3, r = 5, and x = 6.
--------------------------------------------------------------------

Hi

I tried substituting both positive and negative for the variables. I observe that (1) is sufficient to answer the question. Some of the values I considered

10-(-20)> 9-(-19)

-10-(20)>-11-(21)

-10-(-20)>-11-(-19)

Think the answer should be D. Did you come across any set of values for which it fails?

Prasanna
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Re: 500 DS

by gabriel » Mon Apr 02, 2007 4:00 am
dunkin77 wrote:Hi,

The answer is D but I thought the answer was B because 1) dose not say if Y and S are positive....


Is x – y > r – s?
(1) x > r and y < s?
(2) y = 2, s = 3, r = 5, and x = 6.
remember this rule.... if a(1)>a(2) and a(3) > a(4) ...... then a(1) + a(3)>a(2)+a(4)....


applying this rule to the first statement ... x>r and s>y... so x+s>y+r ... so x-y>r-s ... so A is sufficient...
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