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If K is not equal 0,1 or -1 , Is 1/K>0 1) 1/k-1 > 0 2)

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Manager
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Joined: 19 Oct 2008
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If K is not equal 0,1 or -1 , Is 1/K>0 1) 1/k-1 > 0 2) [#permalink]

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New post 14 Mar 2009, 12:54
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A
B
C
D
E

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If K is not equal 0,1 or -1 , Is 1/K>0

1) 1/k-1 > 0
2) 1/k+1 > 0

Kudos [?]: 52 [0], given: 0

Director
Director
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Joined: 01 Apr 2008
Posts: 872

Kudos [?]: 869 [0], given: 18

Name: Ronak Amin
Schools: IIM Lucknow (IPMX) - Class of 2014
Re: DS GMAT Prep - Inequalities [#permalink]

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New post 15 Mar 2009, 02:11
Should be A.
1/k-1 > 0 => denominator is +ve => k-1 >0 => k>1 => 1/k >0

1/k+1 > 0 => k+1 > 0 => k>-1 => 1/k may or may not be >0.

Kudos [?]: 869 [0], given: 18

Intern
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Joined: 07 Feb 2009
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Kudos [?]: 17 [0], given: 1

Re: DS GMAT Prep - Inequalities [#permalink]

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New post 15 Mar 2009, 06:53
I agree with u Economist.
If we consider second case/ statement, we get k>-1 , which means k can be a positive or a negative number, depends whether it falls into (-1,0) or [0, any +ve no).

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Intern
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Kudos [?]: 4 [0], given: 2

Schools: HBS, Stanford
Re: DS GMAT Prep - Inequalities [#permalink]

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New post 15 Mar 2009, 08:49
I think it is D

1) see explanation above

2) means: k+1 > 0 thus k > -1 => k must be 2 or greater (as 0 and 1 are not allowed per instructions). For all those cases 1/k > 0 => sufficient

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Manager
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Kudos [?]: 52 [0], given: 0

Re: DS GMAT Prep - Inequalities [#permalink]

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New post 16 Mar 2009, 08:31
If K>-1, it can be -0.8 since K is not necessarily an integer. Therefore, statment 2 is not sufficient. OA is A.

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Re: DS GMAT Prep - Inequalities [#permalink]

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New post 16 Mar 2009, 13:03
Accountant wrote:
If K is not equal 0,1 or -1 , Is 1/K>0

1) 1/k-1 > 0
2) 1/k+1 > 0


It's A.

1. 1/k>1 suff.
2. 1/k>-1 not suff. (it does not say that k must be an integer)

Kudos [?]: 14 [0], given: 0

Re: DS GMAT Prep - Inequalities   [#permalink] 16 Mar 2009, 13:03
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