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If the 9th term of an A P is five times the 5th... - JAMB Mathematics 2002 Question

If the 9th term of an A.P is five times the 5th term, find the relationship between a and d.
A
2a + 2 = 0
B
3a + 5d = 0
C
a + 3d = 0
D
a + 2d = 0
correct option: c
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