सारणिकों का मान ज्ञात कीजिए \[ \left|\begin{array}{cc} 2 & 4 \\ -5 & -1 \end{array}\right| \]

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सारणिकों का मान ज्ञात कीजिए
\[
\left|\begin{array}{cc}
2 & 4 \\
-5 & -1
\end{array}\right|
\]
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