CUET · MATHS · PYQ PAPER 2025
If \(A=\left[\begin{array}{ccc}0 & 0 & \sqrt{3} \\ 0 & \sqrt{3} & 0 \\ \sqrt{3} & 0 & 0\end{array}\right]\), then \(|\operatorname{adj} A|\) is equal to:
- A \(3\)
- B \(9\)
- C \(27\)
- D \(81\)
Answer & Solution
Correct Answer
(C) \(27\)
Step-by-step Solution
Detailed explanation
\(|A| = \sqrt{3}(0 - \sqrt{3} \cdot \sqrt{3})\) \(|A| = \sqrt{3}(-3) = -3\sqrt{3}\) \(|\operatorname{adj} A| = |A|^{n-1}\) \(|\operatorname{adj} A| = (-3\sqrt{3})^{3-1} = (-3\sqrt{3})^2\) \(|\operatorname{adj} A| = 9 \cdot 3 = 27\)
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