Question

If nineth team of an A.P. is zero then show that 29th team is double the 19th team.

Answer 1

Answer:

9th term i.e,

a+8d=0

29th term = 2(19th term)

a+28d = 2(a+18d)

-8d+28d = 2(-8d+18d)

20d = 20d

solved