$\"\"$

The geometric series is $\"\"$ .

Find the common ratio.

$\"\"$ .

The common ratio is $\"\"$ .

The first term of the series is $\"\"$ .

Formula for the sum of finite geometric series: $\"\"$ .

Find the sum of first five terms.

Substitute $\"\"$ , $\"\"$ and $\"\"$ .

$\"\"$

$\"\"$ .

The sum of first five terms is $\"\"$ .

$\"\"$

The sum of first five terms is $\"\"$ .