Events & Promotions
|
|
GMAT Club Daily Prep
Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.
Customized
for You
Track
Your Progress
Practice
Pays
Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.
Apr 2808:00 AM PDT
-11:00 AM PDT
Whether you are just beginning your MBA journey or fine-tuning your path to a 700+ score, GMAT Day is designed to give you a competitive edge.
19 Nov 2019, 02:25
Kudos
Bookmarks
D
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
5%
(low)
Question Stats:
89% (01:29) correct
11%
(02:01)
wrong
based on 85
sessions
History
Date
Time
Result
Not Attempted Yet
[GMAT math practice question]
\(a, b\), and \(c\) are different numbers. <\(a, b, c\)> denotes \(\frac{(2b - c)}{(2a + c)}. \)
Let <\(a, b, c\)> be \(A\). What is <\(b, a, -c\)>?
A. \(A^2\)
B. \(2A\)
C. \(3A\)
D. \(\frac{1}{A}\)
E. \(\frac{2}{A}\)
\(a, b\), and \(c\) are different numbers. <\(a, b, c\)> denotes \(\frac{(2b - c)}{(2a + c)}. \)
Let <\(a, b, c\)> be \(A\). What is <\(b, a, -c\)>?
A. \(A^2\)
B. \(2A\)
C. \(3A\)
D. \(\frac{1}{A}\)
E. \(\frac{2}{A}\)
19 Nov 2019, 02:53
Kudos
Bookmarks
MathRevolution
Explanation: We have to follow the sequence of <a,b,c>.
<a,b,c>= (2b-c)/(2a+c) = A
now, Sequence is <b,a,-c>, so a is replaced by b;
b by a; & c by -c.
So putting in eqn (2b-c)/(2a+c)
we get, {2(a)-(-c)}/{2(b)+(-c)}
= (2a+c)/(2b-C)= which 1/A. So option D is answer.
please give kudos, if you find my explanation good enough
21 Nov 2019, 01:56
Kudos
Bookmarks
=>
\(<b, a, -c> = \frac{(2a - (-c))}{(2b + (-c))} = \frac{(2a + c)}{(2b - c)} = 1/\frac{{(2b - c)}{(2a + c)}} = \frac{1}{<a, b, c>} = \frac{1}{A}.\)
Therefore, D is the answer.
Answer: D
\(<b, a, -c> = \frac{(2a - (-c))}{(2b + (-c))} = \frac{(2a + c)}{(2b - c)} = 1/\frac{{(2b - c)}{(2a + c)}} = \frac{1}{<a, b, c>} = \frac{1}{A}.\)
Therefore, D is the answer.
Answer: D
