If k#0, 1, or -1, is 1/k>0?
1. 1/(k-1)>0
2. 1/(k+1)>0
Ans. A
GMAT Prep question - please explain
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1 - If 1/(k-1) > 0, then k > 1 and hence positive. So, 1/k > 0.
Sufficient
2 - If 1/(k+1) > 0, then k > -1. K is not given to be an integer and
can take values -0.5, 0.5, 2 etc. So, 1/k can be positive or negative.
Insufficient.
Hence A
Sufficient
2 - If 1/(k+1) > 0, then k > -1. K is not given to be an integer and
can take values -0.5, 0.5, 2 etc. So, 1/k can be positive or negative.
Insufficient.
Hence A