Question

If A is a square matrix of order 3, |A′| = −3, then |AA′| = ______.

विकल्प

• 9

• −9

• 3

• −3

Answer 1

If A is a square matrix of order 3, |A′| = −3, then |AA′| = 9.

Explanation:

|AA'| = |A||A'|

= (−3)(−3)

= 9