Question

If A is a square matrix of order 3 and |A| = 5, then |adj A| = ______.

Options

• 5

• 25

• 125

• `1/5`

Answer 1

If A is a square matrix of order 3 and |A| = 5, then |adj A| = 25.

Explanation:

 |adj A| = |A|^n–1

⇒ |adj A| = 25