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g.shankaran
- Master | Next Rank: 500 Posts
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Hi,
From(1): 1/(k-1) > 0. So, k-1>0 =>k > 1. So, k is positive. 1/k > 0
sufficient
From(2): 1(k+1)>0. So, k+1>0 =>k>-1
for -1<k<0, 1/k <0
for k>0, 1/k>0
Insufficient
Hence, A
