A) \[\left[ \begin{matrix} 2 & -7 \\ -1 & 4 \\ \end{matrix} \right]\]
B) \[\left[ \begin{matrix} 2 & -1 \\ -7 & 4 \\ \end{matrix} \right]\]
C) \[\left[ \begin{matrix} -2 & 7 \\ 1 & -4 \\ \end{matrix} \right]\]
D) \[\left[ \begin{matrix} -2 & 1 \\ 7 & -4 \\ \end{matrix} \right]\]
Correct Answer: A
Solution :
\[{{A}^{-1}}=\frac{Adj\,(A)}{|A|}\]; \[{{A}^{-1}}=\left[ \begin{matrix} 2 & -7 \\ -1 & 4 \\ \end{matrix} \right]\]
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