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# Inequality

Author Message
Director
Status: No dream is too large, no dreamer is too small
Joined: 14 Jul 2010
Posts: 614

Kudos [?]: 1139 [0], given: 39

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04 Jun 2011, 12:53
00:00

Difficulty:

(N/A)

Question Stats:

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

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Kudos [?]: 1139 [0], given: 39

Math Forum Moderator
Joined: 20 Dec 2010
Posts: 1964

Kudos [?]: 2055 [0], given: 376

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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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Kudos [?]: 2055 [0], given: 376

Director
Joined: 01 Feb 2011
Posts: 726

Kudos [?]: 144 [0], given: 42

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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

Kudos [?]: 144 [0], given: 42

Re: Inequality   [#permalink] 04 Jun 2011, 15:42
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