A) 0
B) 10
C) 20
D) 100
Correct Answer: B
Solution :
\[A(adj\,.\,A)=|A|\,I\Rightarrow \,\left| \,\begin{matrix} 10 & 0 \\ 0 & 10 \\ \end{matrix}\, \right|=10\,.\,\left| \,\begin{matrix} 1 & 0 \\ 0 & 1 \\ \end{matrix}\, \right|\].
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