A) I
B) A
C) B
D) 0
Correct Answer: A
Solution :
\[A=\left[ \begin{matrix} 1 & 0 & 0 \\ 2 & 1 & 0 \\ -3 & 2 & 1 \\ \end{matrix} \right],B=\left[ \begin{matrix} 1 & 0 & 0 \\ -2 & 1 & 0 \\ 7 & -2 & 1 \\ \end{matrix} \right]\] \[AB=\left[ \begin{matrix} 1 & 0 & 0 \\ 0 & 1 & 0 \\ 0 & 0 & 1 \\ \end{matrix} \right]=I\]
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