$\"\"$

The sum of an infinite geometric series is $\"\"$ , with $\"\"$ ,

Where $\"\"$ is first term and r is common ratio.

The infinite geometric series is $\"\"$ .

In the series are $\"\"$ .

$\"\"$ , the sum exists.

$\"\"$ (Substitute $\"\"$ )

$\"\"$ (Subtract denominator: $\"\"$ ) $\"\"$

The sum of the infinite geometric series is $\"\"$ .