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TS EAMCET · Maths · Determinants

Let \(\mathrm{A}, \mathrm{B}\) be two \(3 \times 3\) matrices and \(\mathrm{C}\) be a \(3 \times 3\) unit matrix such that \(A B-C\) is a non-singular matrix. Let \(\mathrm{D}=(\mathrm{AB}-\mathrm{C})^{-1}\). Then, consider the following statements.
Statement I : \(\operatorname{det}(\mathrm{BA})=\operatorname{det}(\mathrm{BA}-\mathrm{C}) \operatorname{det}(\mathrm{BDA})\)
Statement II : ABD = DAB
Which of the above statements is (are) true?

  1. A Statement I is true, but Statement II is false
  2. B Statement II is true, but Statement I is false
  3. C Both Statement I and Statement II are true
  4. D Both Statement I and Statement II are false
Verified Solution

Answer & Solution

Correct Answer

(C) Both Statement I and Statement II are true

Step-by-step Solution

Detailed explanation

Let \(A=\left[\begin{array}{lll}1 & 0 & 0 \\ 0 & 0 & 0 \\ 0 & 0 & 0\end{array}\right], B=\left[\begin{array}{lll}0 & 0 & 0 \\ 0 & 0 & 1 \\ 0 & 0 & 0\end{array}\right]\) and \(C=\left[\begin{array}{lll}1 & 0 & 0 \\ 0 & 1 & 0 \\ 0 & 0 & 1\end{array}\right]\) (given) now…