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Inequality

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Inequality [#permalink] New post 04 Jun 2011, 12:53
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Question Stats:

66% (01:19) correct 33% (00:46) wrong based on 0 sessions
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Re: Inequality [#permalink] New post 04 Jun 2011, 14:49
Baten80 wrote:
If k is not equal to 0,1,-1, is \frac{1}{k} > 0?

1. \frac{1}{(k-1)}>0

2. \frac{1}{(k+1)}>0


Sol:

Q: Is k>0?

1.
k-1>0

k>1

Sufficient.

2.
k+1>0

k>-1

k can be -0.8
Or
k can be 1.8

Not Sufficient.

Ans: "A"
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Re: Inequality [#permalink] New post 04 Jun 2011, 15:42
1. Sufficient

k-1 > 0 => k>1

=> 1/k >0

2. Not sufficient

k+1 >0
k>-1

if k = -0.5 then 1/k is not greater than 0

if k = 2 then 1/k is greater than 0

Answer is A.
Re: Inequality   [#permalink] 04 Jun 2011, 15:42
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