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  87. Column A For all n > 0, n* = . Column B ... ...

 
Column A Column B
    n

(A) Column A is larger
(B) ...
(C) ...
(D) ...
(E) ...

*This question is included in Nova Math - Problem Set G: Quantitative Comparisons

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Posted: 04/03/2013 16:34
There is no mention that the N in column B is n>o
????
Contributor
 
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Posted: 04/16/2013 19:15
Luigi, you are right. The problem should have said n > 0 and n* = √n, without "For all".
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  87. Column A For all n > 0, n* = . Column B ... ... 
Posted: 03/26/2015 19:56
By definition the square root is positive and negative, so it should be D. Shouldn't it?
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Posted: 03/26/2015 22:04
Hi Daniel,

√n is only positive. You get a positive and a negative root when you introduce a root by performing a mathematical operation. For example, to solve the equation x^2 = 4, we square root both sides of the equation, which gives x = square root of 4 and x = negative square root of 4, or x = 2 and x = -2.

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