JEE Mains · Maths · STD 12 - 3 and 4 . metrices and determinant
Let A be a \(3\times3\) matrix such that \(A+A^{T}=O\). If \(A\begin{bmatrix}1\\ -1\\ 0\end{bmatrix}=\begin{bmatrix}3\\ 3\\ 2\end{bmatrix}\), \(A^{2}\begin{bmatrix}1\\ -1\\ 0\end{bmatrix}=\begin{bmatrix}-3\\ 19\\ -24\end{bmatrix}\) and \(\det(adj(2adj(A+I)))\) = \((2)^\alpha \cdot(3)^\beta \cdot(11)^\gamma\), then \(\alpha+\beta+\gamma\) is equal to ___ .
- A 16
- B 18
- C 20
- D 22
Answer & Solution
Correct Answer
(B) 18
Step-by-step Solution
Detailed explanation
\(A\left[\begin{array}{l}1 \\ -1 \\ 0\end{array}\right]=\left[\begin{array}{l}3 \\ 3 \\ 2\end{array}\right]\) and \(A\left[\begin{array}{l}3 \\ 3 \\ 2\end{array}\right]=\left[\begin{array}{l}-3 \\ 19 \\ -24\end{array}\right]\)…
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