If $S$ is the sum of the first 10 terms of the series, $\tan ^ { - 1 } \left( \frac { 1 } { 3 } \right) + \tan ^ { - 1 } \left( \frac { 1 } { 7 } \right) + \tan ^ { - 1 } \left( \frac { 1 } { 13 } \right) + \tan ^ { - 1 } \left( \frac { 1 } { 21 } \right) + \ldots\ldots$. then $\tan ( S )$ is equal to :\\
(1) $\frac { 5 } { 6 }$\\
(2) $\frac { 5 } { 11 }$\\
(3) $- \frac { 5 } { 6 }$\\
(4) $\frac { 10 } { 11 }$