CUET · MATHS · PYQ PAPER 2025
Which of the following statements are correct?
(A) If \(A\) is a square matrix, then \(\left|A^2\right|=|A|^2\).
(B) If \(A\) and \(B\) are square matrices of the same order, then \(\operatorname{det}(A B)=\operatorname{det}(A)+\operatorname{det}(B)\).
(C) If \(A\) is a square matrix of order 3 and \(|A|=2\), then the value of \(|-3 A|\) is 54 .
(D) If the matrix \(\left[\begin{array}{cc}5-x & x-1 \\ 3 & 5\end{array}\right]\) is singular, then the value of \(x\) is \(\frac{7}{2}\).
Choose the correct answer from the options given below :
- A (A), (B) and (D) only
- B (A), (B) and (C) only
- C (A) and (D) only
- D (B), (C) and (D) only
Answer & Solution
Correct Answer
(C) (A) and (D) only
Step-by-step Solution
Detailed explanation
\( |A^2| = |A \cdot A| = |A|^2 \). Correct. \( \operatorname{det}(A B) = \operatorname{det}(A) \operatorname{det}(B) \neq \operatorname{det}(A) + \operatorname{det}(B) \). Incorrect. \( |-3 A| = (-3)^3 |A| = -27 \cdot 2 = -54 \neq 54 \). Incorrect. \( (5-x)5 - 3(x-1) = 0 \)…
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