Friday, September 10, 2010

If a and b are integers and a is not equal to b, is ab > 0?

If a and b are integers and a is not equal to b, is ab > 0?

(1) a^b > 0

(2) a^b is a non-zero integer




Is ab>0? Question basically asks are a and b both positive or both negative.

(1) a^b>0 --> both a and b could be positive as well as a could be positive and b negative. Not sufficient.

(2) a^b is a non-zero integer --> if a=1 and b=-1 answer would be NO but if a=1 and b=2 answer would be YES. Not sufficient.

(1)+(2) Example from (2) is still valid. Not sufficient.

Answer: E. 

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