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a, b, and c are different numbers. <a, b, c> denotes (

Expert replies
by Max@Math Revolution » Tue Nov 19, 2019 1:06 am
[GMAT math practice question]

a, b, and c are different numbers. <a, b, c> denotes (2b - c)/(2a + c).
Let < a, b, c > be A. What is < b, a, -c >?

A. A^2
B. 2A
C. 3A
D. 1/A
E. 2/A
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Source: — Problem Solving |

by Max@Math Revolution » Thu Nov 21, 2019 12:34 am
Answer: D

<b, a, -c> = (2a - (-c))/(2b + (-c)) = (2a + c)/(2b - c) = 1/{(2b - c)/(2a + c)} = 1/<a, b, c> = 1/A.

Therefore, D is the answer.
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