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tanyajoseph
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k is not 0, 1 or -1.
1/k > 0
1) 1/(k-1) > 0 this means that k is positive and larger than 1, if it were not true, 1/k <=0, so it's sufficient.
2)1/(k+1)>0 this means that k is eitherpositive or a negative number between -1 and 0, so if k=-0.1 1/k would not be <0, but if k=1.1 1/k > 0 , so not sufficient. Answer is A
