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Inequality

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Director
Director
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Status: No dream is too large, no dreamer is too small
Joined: 14 Jul 2010
Posts: 650
Followers: 37

Kudos [?]: 592 [0], given: 39

Inequality [#permalink]

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New post 04 Jun 2011, 12:53
00:00
A
B
C
D
E

Difficulty:

(N/A)

Question Stats:

71% (01:21) correct 29% (00:46) wrong based on 9 sessions

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Joined: 20 Dec 2010
Posts: 2022
Followers: 154

Kudos [?]: 1418 [0], given: 376

Re: Inequality [#permalink]

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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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Director
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Joined: 01 Feb 2011
Posts: 758
Followers: 14

Kudos [?]: 90 [0], given: 42

Re: Inequality [#permalink]

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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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