Find the rth term of an A.P., the sum of whose first `n` terms is `3n^2+4n`

Find the rth term of an A.P., the sum of whose first n terms is 2n+3n^2 .

Find the rth term of an AP, the sum of whose first n terms is (3n^(2) +2n)

Find the rth term of an A.P., sum of whose first n terms is 2n + 3n^(2) .

Find the rth term of an AP sum of whose first n terms is 2n+3n^(2).

Find the rth term of an AP sum of whose first n terms is 2n+ 3n^(2)

Find te rth term of an AP sum of whose first n terms is 2n+3n^(2).

Write the common difference of an A.P. the sum of whose first \ \ n terms is P/2n^2+Q n

Find the 12th term of a series in A.P., whose sum of n terms is 4n^(2) + 3n .

(i) The sum of the first n terms of an AP is ((5n^(2))/(2) + (3n)/(2)) . Find the nth term and the 20th term of this AP. (ii) The sum of the first n terms of an AP is ((3n^(2))/(2) + (5n)/(2)). Find its nth term and the 25th term.

If the n^(th) term of an A.P.is (2n+1), find the sum of first n terms of the A.P.