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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

  1. A 125
  2. B \(-125\)
  3. C 625
  4. D \(-625\)
Verified Solution

Answer & Solution

Correct Answer

(D) \(-625\)

Step-by-step Solution

Detailed explanation

\(\operatorname{det}(kA) = k^n \operatorname{det}(A)\) \(\operatorname{det}(5A) = 5^3 \operatorname{det}(A)\) \(\operatorname{det}(5A) = 125 \times (-5)\) \(\operatorname{det}(5A) = -625\)