CUET · MATHS · PYQ PAPER 2023
For any 2 × 2 matrix, if \(A(\operatorname{adj} A)=\left[\begin{array}{cc}100 & 0 \\ 0 & 100\end{array}\right]\), then |A| is equal to:
- A 10
- B 20
- C 100
- D 1000
Answer & Solution
Correct Answer
(C) 100
Step-by-step Solution
Detailed explanation
\(A(\operatorname{adj} A) = |A|I\) \(|A|I = \left[\begin{array}{cc}100 & 0 \\ 0 & 100\end{array}\right]\) \(|A| = 100\)
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