- $ \\\overrightarrow {{n_4}} = \\\left( {3\\\,;2\\\,; - 6} \\\right)$.
- $ \\\overrightarrow {{n_2}} = \\\left( {2\\\,;3\\\,;1} \\\right)$.
- $ \\\overrightarrow n = \\\left( {\\\frac{1}{2}\\\,;\\\frac{1}{3}\\\,;1} \\\right)$.
- $ \\\overrightarrow {{n_1}} = \\\left( {2;3\\\,; - 1} \\\right)$.