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help

by nailyad » Sun Dec 20, 2009 2:21 pm
Trying ot figure out is there is the solution with plug in numbers, but obviously not.

If K not zero, 1 or -1. is 1/K>0?

1. 1/k-1>0

2.1/k+1>0

My answer was that each answer worked. GMAT's is only the first answer is correct.
Little help here please?
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Source: — Data Sufficiency |
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by 2011MBAGrad » Sun Dec 20, 2009 9:04 pm
To answer is 1/K>0, if we can find is K>0

Option1: K < 0 does not satisfy the condition. Therefore, K has to be >0. Thus sufficient.
Option2: a. K >0 satisfies the cond.
b. K =-0.5 also satisfies the condition. Therefore, K can be either >0 or <0. Thus, insufficient.

Hence, only option "A" is correct.
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