A) 122
B) ? 144
C) 120
D) ? 120
Correct Answer: B
Solution :
\[\mathbf{a}\,.\,(\mathbf{b}\times \mathbf{c})=\left| \,\begin{matrix} 3 & -2 & \,\,2 \\ 6 & \,\,\,4 & -2 \\ 3 & -2 & -4 \\ \end{matrix}\, \right|\] \[=3\,[-16-4]+2\,[-24+6]+2\,[-12-12]\] = ? 60 ? 36 ? 48 = ? 144.You need to login to perform this action.
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