A) \[\left[ \begin{align} & 43 \\ & 44 \\ \end{align} \right]\]
B) \[\left[ \begin{align} & 43 \\ & 45 \\ \end{align} \right]\]
C) \[\left[ \begin{align} & 45 \\ & 44 \\ \end{align} \right]\]
D) \[\left[ \begin{align} & 44 \\ & 45 \\ \end{align} \right]\]
Correct Answer: A
Solution :
\[\left[ \begin{matrix} 7 & 1 & 2 \\ 9 & 2 & 1 \\ \end{matrix} \right]\,\left[ \begin{matrix} 3 \\ 4 \\ 5 \\ \end{matrix} \right]\,=\,\,\left[ \begin{matrix} 35 \\ 40 \\ \end{matrix} \right]\]; \ \[\left[ \begin{matrix} 35 \\ 40 \\ \end{matrix} \right]\,+\,\left[ \begin{matrix} 8 \\ 4 \\ \end{matrix} \right]\,=\,\left[ \begin{matrix} 43 \\ 44 \\ \end{matrix} \right]\].
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