Question

If A is a unit matrix of order n, then A (adj A) = ___________________.

Answer 1

As we know that, A(adj A) = |A|I.

But it is given that A is a unit matrix of order n
Therefore, A(adj A) = |I|I = (1)I = I

Hence, if A is a unit matrix of order n, then A (adj A) = I.