[" The "14" th term of an A.P.is twice the "8" th term.If the "6" th 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.

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 24 th term of an A.P.is twice its 10 th term. Show that its 72 th term is 4 xx its 15 th term.

If the 9 th term of an A.P.is 35 and the 19th term is 75. Find the 20 th term

The 11 th term of an A.P.is 80 and the 16 th term is 110. Find the 31 st term.

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

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

9th term of A.P.is 0. Prove that 29 th term is twice the 19 th term

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

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.