Detemine the sum of the first 35 terms of an A.P., if `T_2 = 2 and T_7 = 22`

Find the sum of first 10 terms an A.P. if T_1 = - 14 and T_5 = 20.

Find the sum of the first 22 terms of the AP: 8, 3, -2, ………

Find the sum of first n terms of an A.P. whose nth term is 3n+1.

Find the sum of first 22 terms of an AP in which d=7 and 22nd term is 149.

The sum of n terms of an A.P. is 3n^2 + 4n . Find the A.P.

Find the sum S_n of the cubes of the first n terms of an A.P. and show that the sum of first n terms of the A.P. is a factor of S_n .

The sum of the first four terms of an A.P. is 56. The sum of the last four terms is 112. If its first term is 11, then find the number of terms.

The sum of the first three terms of an A.P. is 36 while their product is 1620. Find the A.P.

Find the sum of A.P first term 3 and common difference 2 and n=5