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CUET · MATHS · PYQ PAPER 2023

If A is a square matrix of order 3 and \(|A| = -2\) then, \(|-2A^{-1}|\) is:

  1. A -4
  2. B 4
  3. C 8
  4. D 2
Verified Solution

Answer & Solution

Correct Answer

(B) 4

Step-by-step Solution

Detailed explanation

\(|-2A^{-1}| = (-2)^3 |A^{-1}|\) \(|-2A^{-1}| = (-2)^3 \frac{1}{|A|} = (-8) \frac{1}{-2}\) \(|-2A^{-1}| = 4\)