Question:
Find the adjoint of the given matrix and verify in each case that $A$. $(\operatorname{adj} A)=(\operatorname{adj} A)=m|A| . I$.
$\left[\begin{array}{lll}0 & 1 & 2 \\ 1 & 2 & 3 \\ 3 & 1 & 1\end{array}\right]$
Solution:
Ans. $\left[\begin{array}{ccc}-1 & 1 & -1 \\ 8 & -6 & 2 \\ -5 & 3 & -1\end{array}\right]$