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COMEDK · Maths · 21. Matrices

If \(A\) is a matrix of order 3 such that \(|A|=5\), then the value \(|\operatorname{adj} A|\) 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

\(\begin{array}{ll}|\operatorname{adj} A|=|A|^{n-1} \text {, where } n \text { is order } \\ |\operatorname{adj} A|=(5)^{3-1} \\ |\operatorname{adj} A|=25\end{array}\)