GPREP2 Question

[medea66]

Why can't D be the answer?

[medea66]

Please help.........

[parallel_chase]

k cannot be 1, 0, or -1

Statement I

1/(k-1) >0

Therefore k could be anything greater than 1 and I/k will always be greater than 0.

Sufficient.

Statement II

1/(k+1) > 0

k could be -0.5 in which case 1/k < 0
k could be +0.5 in which case 1/k > 0

Therefore Insufficient.

Hence A is the answer.

Let me know if you still have any doubts.

[bomond]

Please help.........

IMO A

ST 1. In order to be (1/(k-1))>0 k-1 also must be >0. => k>1 In every number that k>1 1/k always >0 SUFF

ST 2. Like the first statement k+1>0 => k>-1. Here we couln't say anything. If k=-0.5 then 1/k<0 but if k=0.5 then 1/k>0 INSUFF