$\"\"$

The geometric series is 54 + 36 + 24 + 16 + .......to 6 terms.

The sum of a geometric series is $\"\"$ ,

The first term of the $\"\"$ and r is common ratio $\"\"$ and n = 6.

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

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

$\"\"$ (Evaluate powers: $\"\"$ )

$\"\"$ (Subtract numerator: $\"\"$ )

$\"\"$ (Divide: $\"\"$ ) $\"\"$

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