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Question:

If the 19th term of a non-zero A.P is zero, then its (49th term) : (29th term) is

3:1

4:1

1:3

2:1

Solution:

The correct option is A
3:1
a+18d=0 (1)
a+48d
a+28d =

(a+48d)/(a+28d) = 3/1