If 19th term of a non-zero AP is zero, t...

If 19th term of a non-zero AP is zero, then its (49th term) : (29 th term) is

A

`1:3`

B

`3:1`

C

`4:1`

D

`2:1`

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The correct Answer is:

B

`because a _(19) =0 therefore " "a + 18d=0`
To find `(a+48d)/(a + 28d) = (-18d + 48d)/(-18d + 28d) =3/1`

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