What is the sum of n terms of the series \(\sqrt 2 + \sqrt 8 + \sqrt {18} + \sqrt {32} + \ldots ?\)
1
\(\frac{{{\rm{n}}\left( {{\rm{n}} - 1} \right)}}{{\sqrt 2 }}\)
2
\(\sqrt 2 {\rm{n}}\left( {{\rm{n}} + 1} \right)\)
3
\(\frac{{{\rm{n}}\left( {{\rm{n}} + 1} \right)}}{{\sqrt 2 }}\)
4
\(\frac{{{\rm{n}}\left( {{\rm{n}} - 1} \right)}}{2}\)