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# If k =/= 0, 1, or -1, is 1/k>0? 1) 1/(k-1) > 0 2)

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Intern
Joined: 03 Mar 2009
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If k =/= 0, 1, or -1, is 1/k>0? 1) 1/(k-1) > 0 2) [#permalink]

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12 Apr 2009, 21:52
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If k =/= 0, 1, or -1, is 1/k>0?

1) 1/(k-1) > 0

2) 1/(K+1) > 0

OA is A. I understand it I just need some more explanation to reinforce my learning...

Kudos [?]: 76 [0], given: 3

Director
Joined: 14 Aug 2007
Posts: 726

Kudos [?]: 211 [0], given: 0

Re: DS: GMATPrep Test 2 [#permalink]

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12 Apr 2009, 21:56
for 2) consider -1<k<0

Kudos [?]: 211 [0], given: 0

Current Student
Joined: 13 Jan 2009
Posts: 365

Kudos [?]: 144 [0], given: 1

Location: India
Re: DS: GMATPrep Test 2 [#permalink]

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12 Apr 2009, 21:57
As per 1 1/(k-1)>0 iff k-1>0 ie k>1

Since K>1 there fore 1/k>0

from 2 K>-1 which can have positive and -ve values. Hence it is not suff to answer.

A wins.

Kudos [?]: 144 [0], given: 1

Manager
Joined: 14 Nov 2008
Posts: 195

Kudos [?]: 129 [0], given: 3

Schools: Stanford...Wait, I will come!!!
Re: DS: GMATPrep Test 2 [#permalink]

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13 Apr 2009, 00:52
Nach0 wrote:
If k =/= 0, 1, or -1, is 1/k>0?

1) 1/(k-1) > 0

2) 1/(K+1) > 0

OA is A. I understand it I just need some more explanation to reinforce my learning...

statement 1,
1/(k-1) > 0. it implies that.. k has to be greater than 1.... which means that 1/k will be greater than 0.
statement 2,
consider k= -.9 , 1/(k+1) is greater than 0, but 1/k less than 0...... hence cannot defintly answer.

Kudos [?]: 129 [0], given: 3

Re: DS: GMATPrep Test 2   [#permalink] 13 Apr 2009, 00:52
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# If k =/= 0, 1, or -1, is 1/k>0? 1) 1/(k-1) > 0 2)

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