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

Find the common difference of the A. P, the Sum of firist 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., sum of whose first n terms is 2n + 3n^(2) .

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 AP sum of whose first n terms is 2n+3n^(2).

Find the common difference of an A.P. whose first term is 5 and the sum of its first four terms is half the sum of the next four terms.

Find the common difference of an A.P. whose first term is 5 and the sum of its first four terms is half the sum of the next four terms.

Find the common difference of an A.P. whose first term is 5 and the sum of its first four terms is half the sum of the next four terms.

Write the expression for the common difference of an A.P. whose first term is a and n t h term is b .

In an A.P. with first term 'a' and the common difference d(a, d!= 0) , the ratio 'rho' of the sum of the first n terms to sum of n terms succedding them does not depend on n . Then the ratio (a)/(d) and the ratio 'rho' , respectively are