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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