If -10 < k < 10, is k > 0 ? : GMAT Data Sufficiency (DS)
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# If -10 < k < 10, is k > 0 ?

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If -10 < k < 10, is k > 0 ? [#permalink]

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05 Jan 2010, 21:22
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If -10 < k < 10, is k > 0 ?

(1) 1/k > 0
(2) k^2 > 0

OPEN DISCUSSION OF THIS QUESTION IS HERE: if-10-k-10-is-k-135874.html
[Reveal] Spoiler: OA

Last edited by Bunuel on 09 Feb 2016, 22:28, edited 2 times in total.
Renamed the topic, edited the question and added the OA.
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Re: If -10 < k < 10, is k > 0 ? [#permalink]

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06 Jan 2010, 06:24
if -10 < k < 10 ,is k > 0 ?

(1) 1/k > 0

k cannot be 0 ; this is a rule. If you get a 0 in the denominator then the fraction is undefined. Consequently you cannot have 1/0. Moreover, 1/k > 0 then K is ]0;10]. K cannot be negative.
Statement 1 is sufficient.

(2) k^2 > 0
K could be negative or positive, we do not know. Statement 2 is insufficient.

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Re: If -10 < k < 10, is k > 0 ? [#permalink]

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07 Jan 2010, 11:16
Should be A....

1/K > 0 can only be possible if K>0.... SUFF

K^2 > 0 is possible for both K<0 and K>0.... Not SUFF
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Re: If -10 < k < 10, is k > 0 ? [#permalink]

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09 Feb 2016, 20:33
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Re: If -10 < k < 10, is k > 0 ? [#permalink]

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09 Feb 2016, 22:26
sacmanitin wrote:
If -10 < k < 10, is k > 0 ?

(1) 1/k > 0
(2) k^2 > 0

If -10 < k < 10, is k > 0 ?

(1) 1/k > 0 --> $$k>0$$. Sufficient
.
(2) k^2 > 0. This statement just says that $$k\neq{0}$$. Not sufficient.

OPEN DISCUSSION OF THIS QUESTION IS HERE: if-10-k-10-is-k-135874.html
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Re: If -10 < k < 10, is k > 0 ?   [#permalink] 09 Feb 2016, 22:26
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