If  $A$is a square matrix of order $n \times n$, then adj (adj $A$) is equal to

Given data:$A$ is a square matrix of order $\text{'}n$'.
We know that
$adj(adjA)=|A{|}^{n-2}A$, where $A$ is a nonsingular matrix.
$\therefore adj(adj(A\left)\right)=|A{|}^{n-2}A$