If the sum of 8 terms of an A.P. is 64 and the sum of 19 terms is 361, find the sum of n terms.

The sum of 8 terms of an A.P. is -64 and sum of 17 terms is 289. Find the sum of its 'n' terms.

If the sum of p terms of an A.P. is q and the sum of q terms is p , then the sum of the p+q terms will be

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

If the sum of p terms of an AP is q and the sum of q terms is p, then show that the sum of p+q terms is - (p+q) , Also find the sum of first p-q terms (where , pgtq ).

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

If the sum of m terms of an A.P. is same as the sum of its n terms, then the sum of its (m+n) terms is

The sum of first 8 terms of an A.P. is 64 and that of first 15 terms is 225. Find the sum of its first 17 terms.

If the sum of first 6 terms of A.P.is 96 and sum of first 10 terms is 240 ,then find the sum of n terms of A.P.