Question

If the sum of n terms of an A.P. is 2n² + 5n, then its nth term is

(a) 4n − 3

(b) 3n − 4

(c) 4n + 3

(d) 3n + 4

Answer 1

Here, the sum of first n terms is given by the expression,

We need to find the n^th term.

So we know that the n^thterm of an A.P. is given by,

So,

Using the property,

We get,

Therefore,

Hence the correct option is (c).