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

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Intern
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Joined: 01 Mar 2009
Posts: 40
Is 1/p > r/(r^2+2)? 1) p=r 2) r>0 [#permalink]

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New post 17 Mar 2009, 22:55
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Is 1/p > r/(r^2+2)?

1) p=r
2) r>0

Please explain

OA will be posted shortly.

Thanks,

--== 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!

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Manager
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Joined: 02 Mar 2009
Posts: 122
Re: DS: PT2 [#permalink]

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New post 17 Mar 2009, 23:08
It is C

1. You can multiply both sides by r^2 + 2 because this quantity is always positive. Hence the inequality sign does not change. Then replacing p for r and simplifying, we get:
Is p + 2/p >p?
For p=1 yes
For p=-1 no

So insufficient

2. Rearranging we get:
Is (r^2 + 2)/p > r?
We dont know anythinga bout p so Insufficient

Together.

the equation becomes:
Is (r^2 + 2)/r > r?
Since r>0, multiply both sides by r and the sign does not change. You get
r^2 +2 > r^2

True!
VP
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Joined: 28 Dec 2005
Posts: 1482
Re: DS: PT2 [#permalink]

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New post 18 Mar 2009, 09:06
i agree with C

From stat 1, you dont know the sign of p and r. Depending on whether p/r is positive or negative, the inequality either holds or doesnt. Insuff.

From stat 2, you know r is positive, but nothing about p. Insuff.

Together, you know that p and r are positive. Testing with fractions (i.e. btwn 0 and 1) and whole numbers, the inequality is always true. Suff

--== 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: DS: PT2   [#permalink] 18 Mar 2009, 09:06
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