\"\"

\

The given geometric series \"\".

\

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

\

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

\

Method 1

\

\"\"              (Substitute \"\")

\

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

\

Evaluate powers: \"\".

\

\"\"

\

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

\

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

\

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

\

The sum of the geometric series is 7.75.