\[\sqrt{3};\ \ 3;\ldots\]
\[b_{1} = \sqrt{3};\ \ b_{2} = 3;\ \]
\[\ q = \frac{3}{\sqrt{3}} = \frac{3\sqrt{3}}{3} = \sqrt{3}.\]
\[S_{6} = \frac{\sqrt{3}\left( \left( \sqrt{3} \right)^{6} - 1 \right)}{\sqrt{3} - 1} =\]
\[= \frac{\sqrt{3}(27 - 1)}{\sqrt{3} - 1} =\]
\[= \frac{26\sqrt{3}\left( \sqrt{3} + 1 \right)}{\left( \sqrt{3} - 1 \right)\left( \sqrt{3} + 1 \right)} =\]
\[= 13\sqrt{3}\left( \sqrt{3} + 1 \right) =\]
\[= 39 + 13\sqrt{3}.\]