Let A be a 2x2 matrix. Statement-1: adj(adj A) = AStatement-2: |adj A| = |A|

Let A=a    bc    d then adj⁡A=d−b−ca⇒ adj⁡(adj⁡A)=a    bc    d=A∴Statement-1 is true.Also, |adjA|=ad−bc=|A|∴ Statement-2 is trueBut statement-2 is not a correct explanation for statement-1.