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Last Updated on May 5, 2023
GMAT OFFICIAL GUIDE PS
Solution:
We are given that operation Ө is defined by aӨb = (a-b)/(a+b).
We are also given that aӨc = 0; thus, according to the operation, all instances of a can remain and all instances of b will be replaced with variable c. We then set that entire expression to zero.
(a-c)/(a+c) = 0
We can multiply both sides of the equation by a+c and then solve for a:
a – c = 0
a = c
Answer: E
