If the sum of a certain number of terms of the AP `25,22,19...` is `116`. Find the last term.

If the sum of a certain number of terms of the A.P. 25, 22, 19.... is 116. Find the last term.

If the sum of a certain number of terms of the A.P. 25, 22, 19.... is 116. Find the last term.

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

Find the sum of last ten terms of the AP 8 , 10 , 12 , …, 126 .

Find the number of terms of the AP 18, 31/2, 13, ....., -99/2 and find the sum of all its terms.

Find the sum of the first 22 terms of the A.P. : 8, 3, -2,………….

Find the sum to 25 terms of the A.P. 5, 7, 9, 11, …

The sum of a series of terms in A.P. is 128. If the first term is 2 and the last term is 14, find the common difference.

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

Find an A.P. in which the sum of any number of terms is always three times the squared number of these terms.