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)

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