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Source: — Data Sufficiency |
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by kevincanspain » Mon May 23, 2011 11:28 pm
If 1/(k+1) > 0, k+1 > 0 i.e k > -1

We are not to assume that k is an integer, so k could be any real number
between - 1 and 0, or any real number greater than 0 other than 1
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by Frankenstein » Mon May 23, 2011 11:30 pm
Thouraya wrote:If k is not equal to 0,1,or -1, is 1/k>0?

1)1/k-1>0
2) 1/k+1>0

The official answer is A, why isn't it D? Thanks
Hi,
From(2) choose k as any number between -1 and 0.
Let's say k=-0.5, 1/k+1 > 0 but 1/k <0
But if k = 0.5, 1/k+1 > 0 and 1/k >0
Not sufficient

Hence, A
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