A) 14
B) \[\left[ \begin{align} & 1 \\ & 4 \\ & 3 \\ \end{align} \right]\]
C) \[\left[ \begin{matrix} 1 & 2 & 3 \\ 2 & 4 & 6 \\ 3 & 6 & 9 \\ \end{matrix} \right]\]
D) None of these
Correct Answer: C
Solution :
\[{A}'=[1\,\,2\,\,3]\], therefore\[A{A}'=\left[ \begin{align} & 1 \\ & 2 \\ & 3 \\ \end{align} \right]\left[ 1\,\,2\,\,3 \right]=\left[ \begin{matrix} 1 & 2 & 3 \\ 2 & 4 & 6 \\ 3 & 6 & 9 \\ \end{matrix} \right]\].
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