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For any 2-rowed square matrix

Question:

For any 2-rowed square matrix $\mathrm{A}$, if $\mathrm{A}(\operatorname{adj} \mathrm{A})=\left(\begin{array}{ll}8 & 0 \\ 0 & 8\end{array}\right)$ then the value of $|\mathrm{A}|$ is

A. 0

B. 8

C. 64

D. 4

Solution:

$|A|=8$

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