Given :9th term is 0

To prove: 29th term is double the 19th term

a + 8d = 0

a = – 8d

29th term is

a + 28d

⟹ 20d

19th term is

a + 18d

⟹ 10d

Hence proved 29th term is double the 19th term

The 9th term of an AP is 0. Prove that its 29th term is double the 19th term.

The 9th term of an AP is 0. Prove that its 29th term is double the 19th term.