Q92 / 180 · KCET 2025 · Mathematics

If $A$ is a square matrix of order $3 \times 3, \operatorname{det} A=3$, then the value of $\operatorname{det}\left(3 A^{-1}\right)$ is

  • A
    $\frac{1}{3}$
  • B
    $3$
  • C
    $27$
  • Correct answer
    D
    $9$

Solution

$\left|3 \mathrm{~A}^{-1}\right|=3^3 \frac{1}{3}=9$

Hence, the correct answer is option: 'D'.

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