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If matrix $A=\left[\begin{array}{ll}a & b \\ c & d\end{array}\right]$, then $|A|^{-1}$ is equal to
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Verified Answer
The correct answer is:
$\frac{1}{a d-b c}$
Given, $\quad A=\left[\begin{array}{ll}a & b \\ c & d\end{array}\right]$
$$
\begin{array}{l}
|A|=a d-b c \\
|A|^{-1}=\frac{1}{a d-b c}
\end{array}
$$
$$
\begin{array}{l}
|A|=a d-b c \\
|A|^{-1}=\frac{1}{a d-b c}
\end{array}
$$
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