If A is a square matrix of order 3 and |A| = 3, then the value of |3 A'| is
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → 81
$|A| = 3,\;\; \text{order of } A = 3$
$|A'| = |A| = 3$
$|3A'| = 3^3 |A'|$
$= 27 \times 3$
$= 81$
The value of $|3A'|$ is $81$.