If the 9th term of an A.P is five times the 5th term, fin...
If the 9th term of an A.P is five times the 5th term, find the relationship between a and d.
2a + 2 = 0
3a + 5d = 0
a + 3d = 0
a + 2d = 0
Correct answer is C
Tn=a+(n−1)d (nth term of an AP).
T9=5T5
a+8d=5(a+4d)⟹a+8d=5a+20d
5a−a+20d−8d=0⟹4a+12d=0
a+3d=0
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