Question

If $A$ and $B$ are matrices of order $3$ and $|A|=5,|B|=3$ then $|3AB|$ is

• A. 425
• B. 405
• C. 565
• D. 585

Answer 1

Answer: (B)

$|3AB|=3^3|AB|$
$=27\times 3\times 5$
$=405$