CUET · MATHS · PYQ PAPER 2025
If A is a square matrix of order 3 and \(|A|=-5\), then \(|3 A|\) is equal to
- A \(-135\)
- B \(-15\)
- C 135
- D 45
Answer & Solution
Correct Answer
(A) \(-135\)
Step-by-step Solution
Detailed explanation
\(|kA| = k^n |A|\) \(|3A| = 3^3 |A|\) \(|3A| = 27 \times (-5)\) \(|3A| = -135\)
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