If the sum of a certain number of terms of the A.P. 25,22,19........is 116 then find the number of terms.

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

Find the number of terms of the A.P. 54, 51, 48, ..... So that their sum is 513.

If the sum of the first 2n terms of the A.P. 2,5,8, "……….." is equal to the sum of the first n terms of the A.P. 57,59,61, "…………" then n equals :

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.

If the sum of first 7 terms of an A.P is 49 and that of 17 terms is 289, find the sum of first n terms.

IF the sum of three consecutive terms of an A.P. is 21, then first the first term.

If the sum of the first n terms of an A.P. is 4n-n^(2) what is the first term? What is the sum of the first two terms? What is the second term? Find the 3rd, 10th, and the nth terms.

The sum of the third and the seventh terms of an A.P. is 6 and the product is 8. Find the sum of first sixteen terms of the A.P.

If the sum of first term of an A.P is 49 and that of 17 terms is 289. Find the sum of first "n" terms. OR The sum of the third and seyenth terms of an AP is 6 and their product is 8. find the sum of first sixteen terms of the A.P.

A G.P. consists of an even number of terms. If the sum of all the terms is 5 times the sum of terms occupying odd places, then find its common ratio.