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If a^2=b, is the value of a between 0 and 1?
(1) b is between 0 and 1 (2) a>b
There is nothing to transform in the original condition and the question. WE have 2 variable (a,b) and 1 equation (a^2=b), thus we need 1 more to match the number of variables and equations. Since there is 1 each in 1) and 2), D is likely the answer.
In case of 1), if b=0.04 then the answer is no if a=-0.2 and yes if a=0.2 Thus it is not sufficient. In case of 2), a>b=a^2, a>a^2, 0>a^2-a, 0>a(a-1), 0<a<1, therefore the answer is yes. Thus the answer is B. _________________
Re: If a^2=b, is the value of a between 0 and 1? [#permalink]
05 Feb 2015, 01:05
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