grandh01 wrote:If K cannot equal 0,1, or -1, is 1/k greater than 0?
1) 1/(k-1) >0
2) 1/(k+1) >0
I don't understand the question, can anyone explain. Thanks in advance.
In order for 1/k to be positive, k must be positive.
Question rephrased: Is k>0?
Statement 1: 1/(k-1) > 0
In order for 1/(k-1) to be positive, k-1 must be positive.
Thus:
k-1>0
k>1
Since k>1, we know that k>0.
SUFFICIENT.
Statement 2: 1/(k+1) > 0
In order for 1/(k+1) to be positive, k+1 must be positive.
Thus:
k+1>0
k>-1
Thus, k could be negative (k = -1/2, for example) or positive (k = 2, for example).
INSUFFICIENT.
The correct answer is
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