Question

Write the $nth$ term of an $A.P.$, the sum of whose $n$ term is $S_n$.

Answer 1

$nth$ term of an $A.P.$

$T_n=a+(n-1)d$

And the sum of $n$ term,

$S_n=\frac{n}{2}[2a+(n-a\left)d\right]$

Hence, this is the answer.