$\"\"$

Find $\"\"$ if $\"\"$ and $\"\"$ .

Find the missing property sequence.

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

Find $\"\"$ :

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

$\"\"$

The value of $\"\"$ is $\"\"$ .

$\"\"$

The value of $\"\"$ is $\"\"$ .