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

ધારોકે \(A=\left[\begin{array}{lll}1 & 2 & 3 \\ a & 3 & 1 \\ 1 & 1 & 2\end{array}\right],|A|=2\).જો \(|2 \operatorname{adj}(2 \operatorname{adj}(2 A ))|\) \(=32^{ n }\) હોય,તો \(3 n +\alpha=........\)

  1. A \(10\)
  2. B \(9\)
  3. C \(12\)
  4. D \(11\)
Verified Solution

Answer & Solution

Correct Answer

(D) \(11\)

Step-by-step Solution

Detailed explanation

\(A=\left[\begin{array}{lll}1 & 2 & 3 \\ a & 3 & 1 \\ 1 & 1 & 2\end{array}\right] \quad| A |=2\) \(1(6-1)-2(2 \alpha-1)+3(\alpha-3)=2\) \(5-4 \alpha+2+3 \alpha-9=2\) \(-\alpha-4=0\) \(\alpha=-4\) \(8|\operatorname{Adj}(2 \operatorname{Adj}(2 A ))|\)…
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