Write the nth term of an A.P. the sum of whose n terms is Sn.
Question:

Write the nth term of an A.P. the sum of whose n terms is Sn.

Solution:

We are given an A.P. the sum of whose n terms is Sn. So, to calculate the nth term of the A.P. we use following formula,

$a_{n}=S_{n}-S_{n-1}$

So, the $n^{\text {th }}$ term of the A.P. is given by $a_{n}=S_{n}-S_{n-1}$.