1.

If \(\vec a + 2\vec b + 3\vec c = \vec 0\) and \(\vec a \times \vec b + \vec b \times \vec c + \vec c \times \vec a = \lambda \left( {\vec b \times \overrightarrow {c\;} } \right),\) then what is the value of λ?

A. 2
B. 3
C. 4
D. 6
Answer» E.


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