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07 Oct 2005, 17:12
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I've heard different things about this topic..
In finding a square root, for example, sqrt(16)
Are 4 and -4 both valid answers? Some say yes, others say no due to imaginary numbers. What really counts, is what does the GMAT count?
Thanks,
Alex
In finding a square root, for example, sqrt(16)
Are 4 and -4 both valid answers? Some say yes, others say no due to imaginary numbers. What really counts, is what does the GMAT count?
Thanks,
Alex
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07 Oct 2005, 18:27
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Off the top of my head, I've seen square root problems in DS but not PS. If it's the latter, I'm guessing the answer choice would probably only have one of the possible answers, e.g. 4 or -4, but NOT both.
So depending on the context of the question, 4 and -4 are correct, but you really have to be careful about what the question is asking, e.g., "Is x a positive number?" Special care in DS too because sufficiency is when a statement gives you one and only one answer, not two. Obviously if a statement gave you a 4 and -4, that statement would be insufficient.
Don't hold me to it though...
Good luck!
So depending on the context of the question, 4 and -4 are correct, but you really have to be careful about what the question is asking, e.g., "Is x a positive number?" Special care in DS too because sufficiency is when a statement gives you one and only one answer, not two. Obviously if a statement gave you a 4 and -4, that statement would be insufficient.
Don't hold me to it though...
Good luck!
Editing (deleted wrong explanation) -
Made a mistake. Himalya's reasoning is correct.
Made a mistake. Himalya's reasoning is correct.
