How To Get The Sum Of Geometric Sequence

How to get the sum of geometric sequence

To get the sum of geometric sequence you need to use this formula:

$S_{n} =\frac{a_{1}(1-r^{n} ) }{1-r}$

Where:

$S_{n}$ is the sum of geometric sequence

r is the common ratio (common ratio must not be equal to 1)

$a_{1}$ is the first term

n is the number of terms

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