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JEE Mains · Maths · STD 12 - 3 and 4 . metrices and determinant

यदि \(\mathrm{A}, \mathrm{B}\) और \(\left(\operatorname{adj}\left(\mathrm{A}^{-1}\right)+\operatorname{adj}\left(\mathrm{B}^{-1}\right)\right)\) समान कोटि के व्युत्क्रमणीय आव्यूह हैं, तो \(\mathrm{A}\left(\operatorname{adj}\left(\mathrm{A}^{-1}\right)+\operatorname{adj}\left(\mathrm{B}^{-1}\right)\right)^{-1} \mathrm{~B}\) = ___

  1. A \(\mathrm{AB}^{-1}+\mathrm{A}^{-1} \mathrm{~B}\)
  2. B \(\operatorname{adj}\left(\mathrm{B}^{-1}\right)+\operatorname{adj}\left(\mathrm{A}^{-1}\right)\)
  3. C \(\frac{A B^{-1}}{|A|}+\frac{B A^{-1}}{|B|}\)
  4. D \(\frac{1}{|A B|}(\operatorname{adj}(B)+\operatorname{adj}(A))\)
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Answer & Solution

Correct Answer

(D) \(\frac{1}{|A B|}(\operatorname{adj}(B)+\operatorname{adj}(A))\)

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Detailed explanation

\begin{aligned} & {\left[\mathrm{A}\left(\operatorname{adj}\left(\mathrm{A}^{-1}\right)+\operatorname{adj}\left(\mathrm{B}^{-1}\right)\right)^{-1} \cdot \mathrm{~B}\right]^{-1}} \\ & \Rightarrow \mathrm{~B}^{-1}…

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