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Is 1/p>r/r^2+2? 1. p=r 2. r>0

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Senior Manager
Joined: 10 Mar 2008
Posts: 342
Is 1/p>r/r^2+2? 1. p=r 2. r>0 [#permalink]

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24 Aug 2008, 16:55
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Is 1/p>r/r^2+2?

1. p=r
2. r>0

--== Message from GMAT Club Team ==--

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Manager
Joined: 12 Feb 2008
Posts: 176

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24 Aug 2008, 17:36
vksunder wrote:
Is 1/p>r/r^2+2?

1. p=r
2. r>0

1. if p <0 is different answer than if p>0, thus insufficient
2. it doesnt tell us anything for p
combining them both tells us that p=r>0, sufficient

SVP
Joined: 29 Aug 2007
Posts: 2453

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24 Aug 2008, 17:52
vksunder wrote:
Is 1/p>r/r^2+2?

1. p=r
2. r>0

1: if r = p >0, (1/p) > [(r)/(r^2+2)]. if not, then (1/p) < [(r)/(r^2+2)]. nsf..........
2: r = 0 doesnot tell much.....

togather r = p >0, (1/p) > [(r)/(r^2+2)].

suff...
C.
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Manager
Affiliations: Beta Gamma Sigma
Joined: 14 Aug 2008
Posts: 207
Schools: Harvard, Penn, Maryland

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24 Aug 2008, 18:10
A is tempting because it does prove that r/r^2-2 is closer to zero than 1/p, but you need the second part to be able to see which side of zero the inequality is on, so both are sufficient. This is an example of DS questions that give you enough with one to make assumptions about it but you must always remember there are two sides to a number line.

--== Message from GMAT Club Team ==--

This is not a quality discussion. It has been retired.

If you would like to discuss this question please re-post it in the respective forum. Thank you!

To review the GMAT Club's Forums Posting Guidelines, please follow these links: Quantitative | Verbal Please note - we may remove posts that do not follow our posting guidelines. Thank you.
Re: DSL Inequalities   [#permalink] 24 Aug 2008, 18:10
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