If {X: 2 d- x d- 19; X integer} and 7 + x = 4
MATHEMATICS
WAEC 2015
If {X: 2 d- x d- 19; X integer} and 7 + x = 4 (mod 9), find the highest value of x
- A. 2
- B. 5
- C. 15
- D. 18
Correct Answer: C. 15
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