Question

If 9 the term of an AP is zero prove that 29th term is doubled of its 19th term

Answer 1

hope I have helped you with my answer

Answer 2

let A.p.

8-, -7, -6, ......0 , 1 ,2 ....., 10 ,......20


you can see that in this A.p

19th term = 10

and

29th term = 20

so

29th term is doubled of 19th term in this A,P