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

माना \(A\) एक \(3 \times 3\) वास्तविक आव्यूह है। यदि \(\operatorname{det}(2 \operatorname{Adj}(2 \operatorname{Adj}(\operatorname{Adj}(2 A ))))=2^{41}\) है, तो \(\operatorname{det}\left( A ^{2}\right)\) का मान बराबर है

  1. A \(2\)
  2. B \(4\)
  3. C \(6\)
  4. D \(8\)
Verified Solution

Answer & Solution

Correct Answer

(B) \(4\)

Step-by-step Solution

Detailed explanation

\(\operatorname{adj}\,(2 \mathrm{~A})=2^{2} \,\mathrm{adj} \mathrm{A}\) \(\Rightarrow \operatorname{adj}(\operatorname{adj}(2 \mathrm{~A}))=\operatorname{adj}(4 \mathrm{adj} \mathrm{A})=16 \mathrm{adj}(\operatorname{adj} \mathrm{A})\) \(=16\, |A|\,\mathrm{A}\)…
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