$\"\"$

The infinite geometric sequence is $\"\"$

Find the common ratio.

The common ratio is

$\"\"$

The common ratio $\"\"$ is $\"\"$ , then $\"\"$ .

The general formula of sum of an infinite geometric series $\"\"$ .

Substitute $\"\"$ and $\"\"$ in the formula

$\"\"$

Sum of an infinite geometric series is $\"\"$

$\"\"$

Sum of an infinite geometric series $\"\"$ is $\"\"$