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DS: Fractions

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Manager
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DS: Fractions [#permalink]

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New post 02 Jan 2009, 18:06
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SVP
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Joined: 04 May 2006
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Schools: CBS, Kellogg
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Re: DS: Fractions [#permalink]

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New post 03 Jan 2009, 06:33
smarinov wrote:
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The question is whether k>0 and k is not equal 1?

1. k>1, clearly suff.

k>1, k must be not 0, 1, -1, k must be bigger than 0, suff

2. k>-1, even combined with k is not 0 and 1, not suff. Keep in mind that k is not integer, so k can be -0.5, then k <0, but k=1, 5 then k>0. Definitely not suff

A is the best
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Re: DS: Fractions [#permalink]

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New post 03 Jan 2009, 06:36
i think its A.

From the question, you basically want to find out if k > 0. The only way stat 1 can be true is if k-1>0, i.e. k>1. Automatically, this means that k>0. Suff.

From stat 2, you know k+1>0, i.e. k>-1. Not enough to say whether k>0 or not. Insuff.

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Re: DS: Fractions [#permalink]

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New post 03 Jan 2009, 15:38
Got A too

k-1 >0 means k > 1 and 1/k is +ve

K+1 > 0 means k > -1

K is not equal to 0, 1, -1 but K can be -0.5 (K is not specified as integer)

K can be positive or negative, Insuff

Hence A

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Re: DS: Fractions [#permalink]

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New post 06 Jan 2009, 10:06
I think it's A

from (1) we got K > 1 suff
from (2) we got K >-1 therefore we can be -1/2 ,-1/3

so it's A

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Re: DS: Fractions [#permalink]

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New post 12 Jan 2009, 01:55
1. 1/(k-1)>0 <=> k>1 so suff
2. 1/(k+1)>0 means k>-1=> insuff

Hence A

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Re: DS: Fractions   [#permalink] 12 Jan 2009, 01:55
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DS: Fractions

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