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# is 1/p > r/(r^2 + 2) 1) p = r 2) r > 0 I got A, but

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Director
Joined: 20 Aug 2007
Posts: 850

Kudos [?]: 99 [0], given: 1

Location: Chicago
Schools: Chicago Booth 2011
is 1/p > r/(r^2 + 2) 1) p = r 2) r > 0 I got A, but [#permalink]

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25 Feb 2008, 09:06
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is 1/p > r/(r^2 + 2)

1) p = r
2) r > 0

I got A, but it's not the right answer.

Kudos [?]: 99 [0], given: 1

CEO
Joined: 17 Nov 2007
Posts: 3584

Kudos [?]: 4593 [1], given: 360

Concentration: Entrepreneurship, Other
Schools: Chicago (Booth) - Class of 2011
GMAT 1: 750 Q50 V40
Re: DS p and r [#permalink]

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25 Feb 2008, 09:13
1
KUDOS
Expert's post
C

1) p = r. for 1: 1>1/3 thrue; for -1: -1>-1/3 false. insufficient.
2) r > 0. Nothing about p. insufficient.

1&2) 1/r>r/(r^2+2)
using (r>0) : $$1>\frac{r^2}{r^2+2}$$ ==> $$1>1 -\frac{2}{r^2+2}$$ ==> $$\frac{2}{r^2+2}>0$$ true. sufficient
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Kudos [?]: 4593 [1], given: 360

Director
Joined: 20 Aug 2007
Posts: 850

Kudos [?]: 99 [0], given: 1

Location: Chicago
Schools: Chicago Booth 2011
Re: DS p and r [#permalink]

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25 Feb 2008, 10:55
Well done, kudos

Kudos [?]: 99 [0], given: 1

Re: DS p and r   [#permalink] 25 Feb 2008, 10:55
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