1.

If \(\rm \vec{a},\vec{b},\vec{c}\) are three non-coplanar vectors, then\(\rm (\vec{a}+\vec{b}+\vec{c}) \cdot[(\vec{a}+\vec{b}) \times( \vec{a}+\vec{c})]=\)

A. 0
B. \(\rm [\vec{a}\; \vec{b} \;\vec{c}]\)
C. 2\(\rm [\vec{a}\; \vec{b} \;\vec{c}]\)
D. -\(\rm [\vec{a}\; \vec{b} \;\vec{c}]\)
Answer» E.


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