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CUET · MATHS · PYQ PAPER 2023

If A is a square matrix of order 3 and |A| = 5, then | adj A| is:

  1. A 5
  2. B 25
  3. C 125
  4. D 625
Verified Solution

Answer & Solution

Correct Answer

(B) 25

Step-by-step Solution

Detailed explanation

\( |\text{adj A}| = |A|^{n-1} \) \( |\text{adj A}| = 5^{3-1} \) \( |\text{adj A}| = 5^2 \) \( |\text{adj A}| = 25 \)