A) [-1]
B) \[\left[ \begin{align} & \,\,\,2 \\ & -1 \\ & -2 \\ \end{align} \right]\]
C) \[\left[ \begin{matrix} \,\,2 & \,\,1 & -1 \\ -2 & -1 & \,\,1 \\ \,\,4 & \,\,2 & -2 \\ \end{matrix} \right]\]
D) Not defined
Correct Answer: C
Solution :
\[\left[ \begin{matrix} \,\,1 \\ -1\, \\ \,\,2 \\ \end{matrix} \right]\,\,[\begin{matrix} 2 & 1 & -1 \\ \end{matrix}]=\left[ \begin{matrix} 2 & 1 & -1 \\ -2\,\,\, & -1\,\,\, & \,\,1 \\ 4 & 2 & -2 \\ \end{matrix} \right]\].
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