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PrintSouth African Mathematics Olympiad
South Africa algebra
Problem
If means the value of , and , the value of must be
(A) 5 (B) 7 (C) 9 (D) 12 (E) 15
(A) 5 (B) 7 (C) 9 (D) 12 (E) 15
Solution
By definition of , we know . If this is , then , so
Final answer
A
Techniques
Simple Equations