If the sum of n terms of an A.P. in `n P" "+1/2n(n-1)Q ,` where P and Q are constants, find the common difference.

If the sum of n terms of an A.P.is nP+(1)/(2)n(n-1)Q, where P and Q are constants,find the common difference.

If the sum of n terms of an A.P. is (pn+qn^(2)), where p and q are constants, find the common difference.

If the sum of n terms of an A.P.is (pn+qn^(2)) where p and q are constants,find the common difference.

If the sum of n terms of an AP is Pn+Qn^(2) where P,Q are constants,then its common differc

Find the sum of n terms of an A.P. whose nth term is (2n+1).

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

Show that the sequence defined by a_(n) = m + (2n - 1) d, where m and d are constants , is an A.P. Find its common difference .

Find the sum of 'n' terms of an A.P. whose nth term is 2n+1.

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