The position vectors of the points \( \mathrm{A} \) and \( \mathrm{B} \) with respect to \( \mat.... VIDEO
The position vectors of the points \( \mathrm{A} \) and \( \mathrm{B} \) with respect to \( \mathrm{O} \) are \( 2 \hat{i}+2 \hat{j}+\hat{k} \) and \( 2 \hat{i}+4 \hat{j}+4 \hat{k} \), then
\( \mathrm{P} \)
\( \frac{1}{2}[(\overrightarrow{O A}) \cdot(\overrightarrow{O B})] \) is
(1) 9
(2) 7
(3) 8
(4) None
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