If the 9th term of an A.P. is zero, then T29 /T 19=k, where k =
(a) 1
(b) 2
(c)3
(d)4
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9th term = 0
that means
a +9d =0
a=-9d
t29/t19 =
a + 28d/a+18d
= -8d +28d/-8d+18d
= 20d/10d
= 2
option b
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