fambrini wrote:If k ≠0, 1 or -1, is 1 / k > 0?
1) 1/(k-1) > 0
2) 1/(k+1) > 0
In order for 1/k to be positive, k must be positive.
Question stem, rephrased:
Is k>0?
Statement 1:
In order for 1/(k-1) to be positive, k-1 must be positive:
k-1>0
k>1.
Thus, k>0.
SUFFICIENT.
Statement 2:
In order for 1/(k+1) to be positive, k+1 must be positive:
k+1>0
k>-1
If k=2, the answer to the question stem is YES.
If k=-1/2, the answer to the question stem is NO.
INSUFFICIENT.
The correct answer is
A.
Last edited by
GMATGuruNY on Sat Oct 22, 2016 7:56 am, edited 1 time in total.
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