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by knight247 » Wed Aug 10, 2011 3:47 am
If n is a positive integer and k=5.1*10^9, what is the value of k?
(1)6000<k<500,000
(2)k²=2.601*10^9

I've figured the answer is D. Pretty straight forward problem.I have a bit of a silly question though. I just wanna know why in statement 2,we don't consider k=±√(2.601*10^9)? thereby making this statement insufficient.
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by Anurag@Gurome » Wed Aug 10, 2011 3:53 am
knight247 wrote:If n is a positive integer and k=5.1*10^9, what is the value of k?
(1)6000<k<500,000
(2)k²=2.601*10^9

I've figured the answer is D. Pretty straight forward problem.I have a bit of a silly question though. I just wanna know why in statement 2,we don't consider k=±√(2.601*10^9)? thereby making this statement insufficient.
Because either in this question k = 5.1*10^9 or in the original question k = 5.1*10^n, which makes k a positive integer.
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