Question

If A is a square matrix of order 3 and |A|=3 then A.(Adj A)=?

Answer 1

 (A*adj(A)) / det(A) and A*inverse of A = (adj(A)*A) / det(A)
note that * means multiply
the above implies that
I = (A*adj(A)) / det(A) and I = (adj(A)*A) / det(A)
From above, we can say that det(A)I = A*adj(A) and det(A)I = adj(A)*A, then
A*adj(A) = adj(A)*A= det(A)*I
-(3) raies to power 1 + 1 will be ans  because i = j 
so we can say that ans will be 3