Question

If $A$ is any square matrix of order $4\times 4$ then $|3A|$ is equal to

• A. $3|A|$
• B. $\frac{1}{81}|A|$
• C. $81|A|$
• D. $\frac{1}{9}|A|$

Answer 1

Answer: (C)

$|kA|=k^n\cdot |A|$