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

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A

$3∣ A ∣$

7%

B

$\frac{1}{81} ∣ A ∣$

27%

C

$81∣ A ∣$

47%

D

$\frac{1}{9} ∣ A ∣$

20%

Solution:

$∣ k A ∣ = k^{n} \cdot ∣ A ∣$