1.

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

Answer»

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



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