Find the common difference of the A. P, the Sum of firist n terms is `2n + 5n^(2)`.

Find the common difference of the A. P, the Sum of whose first n terms is 2n + 5n^(2) .

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

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

If the arithmetic progression whose common difference is nonzero the sum of first 3n terms is equal to the sum of next n terms. Then, find the ratio of the sum of the 2n terms to the sum of next 2n terms.

If the arithmetic progression whose common difference is nonzero the sum of first 3n terms is equal to the sum of next n terms. Then, find the ratio of the sum of the 2n terms to the sum of next 2n terms.

If the arithmetic progression whose common difference is nonzero the sum of first 3n terms is equal to the sum of next n terms. Then, find the ratio of the sum of the 2n terms to the sum of next 2n terms.

The sum of the first n terms of an AP whose first term is 8 and the common difference is 20 is equal to the sum of first 2n terms of another AP whose first term is -30 and the common difference is 8 . Find n .

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

In an A.P., if the first term is 22, the common difference is -4 and the sum to n terms is 64, find n .

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