Sum To N terms of A.P

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.

Questions on Sum of n terms in A.P.

If the sum of n terms of an A.P is cn (n-1)where c ne 0 then the sum of the squares of these terms is

If for every n in N , sum to n terms of an A.P. is 5n^(2)+7n then is 10th term is

If the sum of n terms of an A.P is 2n+3n^(2) , find the r^(th) term

If sum of n terms of an A.P. is 4n^(2) +7n , find the 15^(th) term.