A) \[[\vec{r}\,\,{{\vec{a}}_{1}}\,{{\vec{a}}_{2}}]=0\]
B) \[[\vec{r}\,\,{{\vec{a}}_{2}}\,{{\vec{a}}_{1}}]={{\vec{a}}_{1}}.{{\vec{a}}_{2}}\]
C) \[[\vec{r}\,\,{{\vec{a}}_{2}}\,{{\vec{a}}_{1}}]={{\vec{a}}_{1}}.{{\vec{a}}_{2}}\]
D) None of these
Correct Answer: A
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