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# If K is not equal to 1, 0 or -1 , is 1/k>0 1) 1/k-1>0

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Senior Manager
Joined: 13 Sep 2006
Posts: 282
Location: New York
Followers: 1

Kudos [?]: 8 [0], given: 0

If K is not equal to 1, 0 or -1 , is 1/k>0 1) 1/k-1>0 [#permalink]  20 Nov 2006, 19:26
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Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions
If K is not equal to 1, 0 or -1 , is 1/k>0

1) 1/k-1>0

2) 1/k+1>0
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Senior Manager
Joined: 14 Jul 2005
Posts: 402
Followers: 1

Kudos [?]: 12 [0], given: 0

A

From 1, 1/k-1 > 0, add 1 on both sides, we get 1/k>1 which implies 1/k>0

From 2, 1/k+1>0 i.e. 1/k > -1 , INSUFF
Senior Manager
Joined: 01 Sep 2006
Posts: 301
Location: Phoenix, AZ, USA
Followers: 1

Kudos [?]: 15 [0], given: 0

if K is not equal to 1, 0 or -1 , is 1/k>0

1) 1/k-1>0

2) 1/k+1>0

Sub k = -3 then 1 / ( -3-1) = -1/4 i.e. not greater than zero so cant be -3
sub k=2 then 1 / ( 2-1) =1 i.e. greater than zero

so 1/k-1>0 implies k is +ve value that means 1/k > 0 suff

use ame logic and is uff 2
Director
Joined: 05 Feb 2006
Posts: 899
Followers: 1

Kudos [?]: 54 [0], given: 0

1)1/k-1>0
1/k>1
1>k
k<1... however we do not know whether K is positive or negative...

Insufficient

2)1/k+1>0

1/k>-1
1>-k
-1<k
k>-1.... however we do not know whether it is positive or negative...

Both together:

1/k-1>0
1/k+1>0

2/k>0....k must be positive...

Thus C...

[EDIT]
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.
.
.
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Ammending my answer choice to A

Yes, if 1/k>1.... we should have no doubts any more... k is positive....
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