The 14th term of an A.P. is twice its 8th term. If its 6th term is -8, then find the sum of its first 20 terms.

The 14 th term of an A.P.is twice its 8 th term. If its 6th term is - 8 ,then find the sum of its first 20 terms.

If 29th term of an A.P is twice its 19th term, then the 9th term is

The 29^(th) term of an A.P is twice its 19^(th) term. Its 9^(th) term is equal to

The first term of G.P. is 27 and 8th term is 1/81 . Find the sum of its first 10 terms.

If the sum of first 8 terms of an Arithmetic progression is 136 and that of first 15 terms is 465, then find the sum of first 25 terms. OR Ths sum of the 5th and 9th terms of an A.P. is 40 and the sum of the 8th and 14th term is 64. Find the sum of the first 20 terms.

If the 10^(th) term of an A.P. is 1/5 and its 20^(th) term is 1/3 , then the sum of its first 150 terms is:

If the 10^(th) term of an A.P. is 1/5 and its 20^(th) term is 1/3 , then the sum of its first 150 terms is:

The 17th term of an A.P. is 5 more than twice its 8th term. If the 11th term of the A.P. is 43, find the n^(t h) term.

The first term of a GP is 27 and its 8th terms is 1/81 . Find the sum of its first 10 terms.

The 6th term of an A.P. is 12 and the 8th term is 22, Find the 10th term.