If X 2 d- x d- 19 X integer and 7 x 4 mod 9 fin... - WAEC Mathematics 2015 Question
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 option: c
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