Question

If $A$ is any square matrix of order $2$, then $adj\left(adjA\right)$ =

• A. $A$
• B. $detA$
• C. $A^{-1}$
• D. None of these

Answer 1

The correct option is A $A$

We know that

$adj\left(adjA\right)=|A{|}^{n-2}A$

So, here $adj\left(adjA\right)=|A{|}^{0}A$

$\Rightarrow adj\left(adjA\right)=A$