The sum of n terms of an A.P. is `3n^2-n`.Find the first term and common difference of A.P.

The sum of n terms of an A.P. is 3n^2 + 4n . Find the A.P.

If the sum of n terms of an A.P. is 3n^2 + 2n : Find the rth term.

The sum of n terms of an A.P is n^2 .Find the common difference.

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

If the sum of n terms of an A.P is S_n=3n^2+5n then find the Common difference:

The sum to n terms of an A.P. is n^(2) . Find the common difference.

If the sum of n terms of an A.P. is S_n=3n^2+5n . Write its common difference.

The sum of n terms of an A.P. whose first term is 5 and common difference is 36 is equal to the sum of 2n terms of another A.P. whose first term is 36 and common difference is 5. Find n.

What is the sum of first n terms of an A.P. whose first term is 'a' and common difference is 'd'?

Find the mean of first n terms of an A.P. whose first term is a and common difference is d.