Given that $A$ is a square matrix of order $3 \times 3$ and $|A| = -4$. Find $|\text{adj } A|$.
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → 16 ##
$|\text{adj } A| = |A|^{n-1}$
where $n$ is the order of matrix $A$.
$|\text{adj } A| = (-4)^{3-1} = (-4)^2 = 16$