lt `a_1, a_2, a_3 ....... `terms of this A.P., such that `a_4-a_7+a_10`, then the sum of first 13 terms of this A.P is

If a_1,a_2,a_3,. . . ,a_n. . . are in A.P. such that a_4−a_7+a_10=m , then sum of the first 13 terms of the A.P.is

Let a_1, a_2, a_3, ....a_n,......... be in A.P. If a_3 + a_7 + a_11 + a_15 = 72, then the sum of itsfirst 17 terms is equal to :

7th term of an A.P. is 40. then the sum of the first 13 terms is

7^(th) term of an A.P. is 40. Then, the sum of first 13 terms is

If a_(1),a_(2),a_(3) ………are in A.P. such that (a_4)/(a_7)=(3)/(2) , then the 13^(th) term of the AP is ………….

Let a_1,a_2,a_3 ......, a_n are in A.P. such that a_n = 100 , a_40-a_39=3/5 then 15^(th) term of A.P. from end is

The sum of the first five terms of an A.P. and the sum of the first seven terms of the same A.P. is 167. If the sum of first 10 terms of this A.P. is 235, find the sum of its first twenty terms.

Determine the sum of first 35 terms of an A.P. if a_2=2 and a_7 =22 .