यदि \( \mathrm{A}=\begin{array}{cl}1 & 2 \\ -1 & 3\end{array}, \mathrm{~B}=\begin{array}{ccc}4 &...

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यदि \( \mathrm{A}=\begin{array}{cl}1 & 2 \\ -1 & 3\end{array}, \mathrm{~B}=\begin{array}{ccc}4 & 0 \\ 1 & 5\end{array}, \mathrm{C}=\begin{array}{cc}2 & 0 \\ 1 & -2\end{array} \) तथा \( a=4, b=-2 \) हों तो दिखाइए कि
\[
\mathrm{A}(\mathrm{BC})=(\mathrm{AB}) \mathrm{C}
\]
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