The first four terms of a sequence are shown below. 18,25,32,39 Which expression can be used to find the nth term of the sequence?

Given:

First four terms of a sequence are 18,25,32,39....

To find:

The expression for the nth term of the sequence.

Solution:

It is clear that, 18,25,32,39 are in AP.

Here,

First term: a=18

Common difference: d = 25-18 = 7

The nth term of an AP is

On substituting the values, we get

Therefore, the required expression for nth term of the sequence is .