Question

If A is n $\times$ n matrix, then adj (adj A) =

• A. $| A |^{n -1} A$
• B. $| A |^{n -2} A$
• C. $| A |^{n} A$
• D. none

Answer 1

Answer: (B)

$| A |^{n -2} A$

Answer 2

Note: If A is a non-singular matrix of order (n $\times$ n) then Adj. (Adj. A) = $| A |^{n-2}$ . A