The sum of a geometric sequence is:
\begin{equation*}
S_{n}=\frac{a\left(r^{n}-1)}{r-1}
\end{equation*}
Note, this is assuming \(n\) terms beginning with \(n=1\).
The sum of a geometric sequence is:
Note, this is assuming \(n\) terms beginning with \(n=1\).