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