# If $I$ is the unit matrix of order $n$. Where$K\neq 0$ is a constsnt , then adj (KI)=
$\begin{array}{1 1}(1) K^{n}(adj I)&(2)K(adj I)\\(3)K^{2}(adj(I))&(4)K^{n-1}(adj I)\end{array}$