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

જો \(A =\frac{1}{5 ! 6 ! 7 !}\left[\begin{array}{lll}5 ! & 6 ! & 7 ! \\ 6 ! & 7 ! & 8 ! \\ 7 ! & 8 ! & 9 !\end{array}\right]\),હોય તો \(|\operatorname{adj}(\operatorname{adj}(2 A ))|=.........\)

  1. A \(2^8\)
  2. B \(2^{12}\)
  3. C \(2^{20}\)
  4. D \(2^{16}\)
Verified Solution

Answer & Solution

Correct Answer

(D) \(2^{16}\)

Step-by-step Solution

Detailed explanation

\(|\operatorname{adjadj}(2 A )|=|2 A |^{( n -1)^2}\) \(=|2 A |^4\) \(=\left(2^3| A |\right)^4\) \(=2^{12}| A |^4 \Rightarrow 2^{16}\) \(|A|=\frac{1}{5 ! 6 ! 7 !} 5 ! 6 !\left|\begin{array}{lll}1 & 6 & 42 \\ 1 & 7 & 56 \\ 1 & 8 & 72\end{array}\right|\)…
Same subject
Explore more questions on app
From JEE Mains
Explore more questions on app