CUET · MATHS · PYQ PAPER 2025
Let \(A=\left[a_{i j}\right]_{3 \times 3}\) such that \(|A|=-5\). Then the value of \(\operatorname{det}(5 A)\) is equal to
- A 125
- B \(-125\)
- C 625
- D \(-625\)
Answer & Solution
Correct Answer
(D) \(-625\)
Step-by-step Solution
Detailed explanation
\(\operatorname{det}(kA) = k^n \operatorname{det}(A)\) \(\operatorname{det}(5A) = 5^3 \operatorname{det}(A)\) \(\operatorname{det}(5A) = 125 \times (-5)\) \(\operatorname{det}(5A) = -625\)
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