$\"\"$

The geometric sequence is $\"\"$

Find $\"\"$ , first term $\"\"$ .

Common ratio of $\"\"$ , $\"\"$ , So $\"\"$ .

Apply nth term $\"\"$ of a geometric sequence formula $\"\"$ .

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

$\"\"$ (Subtract power: $\"\"$ )

$\"\"$ (Evaluate power: $\"\"$ )

$\"\"$ (Multiply: $\"\"$ ) $\"\"$

The value of $\"\"$ .