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Integer ?s
Source: Beat The GMAT — Data Sufficiency |
Yes the answer should be c..as 1 and 2 alone are not sufficient...to solve it would be like y^3=27..so y =3
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VP_RedSoxFan
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(1) This statement narrows the value of y to {1, 3, 9, 27} but obviously not a single value like we're looking for so its insufficient.
(2) x = y^2. The most tempting thing about this one is if you let knowledge and information from (1) bleed onto it. This actually doesn't limit y to anything other than y^2 being an integer or, rather, that y is the square root of x.
Combining the two, however gets us there because (1) limits our choices to {1, 3, 9, 27} and (2) limits our possibilities to perfect square roots. In that set of available choices, only 3 is the square root of another factor of 27.
Ans: [C]
(2) x = y^2. The most tempting thing about this one is if you let knowledge and information from (1) bleed onto it. This actually doesn't limit y to anything other than y^2 being an integer or, rather, that y is the square root of x.
Combining the two, however gets us there because (1) limits our choices to {1, 3, 9, 27} and (2) limits our possibilities to perfect square roots. In that set of available choices, only 3 is the square root of another factor of 27.
Ans: [C]
Ryan S.
| GMAT Instructor |
Elite GMAT Preparation and Admissions Consulting
www.VeritasPrep.com
Learn more about me
| GMAT Instructor |
Elite GMAT Preparation and Admissions Consulting
www.VeritasPrep.com
Learn more about me
