Question

If A is a square matrix of order 2,then |Adj A|

• A. | A|
• B. $|A{|}^2$
• C. $|A{|}^3$
• D. none of these

Answer 1

Answer: (A)

A - A' is skew symmetric. [ $\because$ (A - A')' - A'- (A')' = A' - A = - (A - A')]