4. दर्शाइए कि \[ \left[\begin{array}{cc} 5 & -1 \\ 6 & 7 \end{array}\right]\left[\begin{array}{l...

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4. दर्शाइए कि
\[
\left[\begin{array}{cc}
5 & -1 \\
6 & 7
\end{array}\right]\left[\begin{array}{ll}
2 & 1 \\
3 & 4
\end{array}\right] \neq\left[\begin{array}{ll}
2 & 1 \\
3 & 4
\end{array}\right]\left[\begin{array}{cc}
5 & -1 \\
6 & 7
\end{array}\right]
\]
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