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Updated on: 29 Aug 2013, 13:55
Originally posted by reliablevish on 29 Aug 2013, 13:51.
Last edited by Bunuel on 29 Aug 2013, 13:55, edited 1 time in total.
Last edited by Bunuel on 29 Aug 2013, 13:55, edited 1 time in total.
Renamed the topic and edited the question.
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D
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Difficulty:
15%
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Question Stats:
80% (00:47) correct
20%
(01:11)
wrong
based on 91
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Each of a, b, and c is positive. Does \(b = \sqrt{ac}\)?
(1) \(\frac{a}{b} = \frac{b}{c}\)
(2) \(\frac{1}{b^3} = \frac{1}{abc}\)
(1) \(\frac{a}{b} = \frac{b}{c}\)
(2) \(\frac{1}{b^3} = \frac{1}{abc}\)
Pure algebraic questions like this one are no longer part of the GMAT Data Sufficiency syllabus.
For relevant Data Sufficiency questions, please check the Data Sufficiency forum:
Data Sufficiency Forum
Data Sufficiency Forum
29 Aug 2013, 13:58
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Each of a, b, and c is positive. Does \(b = \sqrt{ac}\)?
(1) \(\frac{a}{b} = \frac{b}{c}\). Cross-multiply: \(b^2=ac\) --> \(b = \sqrt{ac}\). Sufficient.
(2) \(\frac{1}{b^3} = \frac{1}{abc}\). Cross-multiply: \(b^3=abc\) --> reduce by b: \(b^2=ac\). Sufficient.
Answer: D.
(1) \(\frac{a}{b} = \frac{b}{c}\). Cross-multiply: \(b^2=ac\) --> \(b = \sqrt{ac}\). Sufficient.
(2) \(\frac{1}{b^3} = \frac{1}{abc}\). Cross-multiply: \(b^3=abc\) --> reduce by b: \(b^2=ac\). Sufficient.
Answer: D.
29 Mar 2017, 06:10
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