6^(*)" Sum of first "55" terms in an A.P.is "3300" ,find its "28^(" th ")" term."

Sum of first 55 terms in an A.P is 3300 . Find its 28th term.

The sum of the first n terms of an A.P.is 3n+n^(2) find "(1)" the first term "(2)" and the sum of the first two terms

If the sum of the first n terms of an A.P.is (1)/(2)(3n^(2)+7n), then find its nth term.Hence write its 20 th term.

The sum of first n terms of an A.P.is 5n-n^(2) . Find the nth term of this A.P.

The sum of first 15 terms of an A.P. is 750 and its first term is 15. Find its 20th term.

If s_(n), the sum of first n terms of an A.P.is given by S_(n)=5n^(2)+3n, then find its n^(th) term.

The sum of first six terms of an AP.is 42. The ratio of its 10^(th) term to its 30^(th) term is 1:3 . Find the first term of the A.P.

The sum of first 7 terms of an A.P.is 10 and that of next 7 terms is 167. Find the progression.

If the sum of first 14 terms of an A.P. is 1050 and its first term is 10, find the 20^(th) term.

If the sum of first 14 terms of an A.P. is 1050 and its first term is 10, find the 20^(th) term.