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

माना \(A=\left[\begin{array}{cc}2 & -1 \\ 1 & 1\end{array}\right]\)। यदि \(\mathrm{A}^{13}\) के विकर्ण के अवयवों का योग \(3^{\mathrm{n}}\), है, तो \(\mathrm{n}\) = ...........

  1. A \(7\)
  2. B \(9\)
  3. C \(6\)
  4. D \(1\)
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Answer & Solution

Correct Answer

(A) \(7\)

Step-by-step Solution

Detailed explanation

\(A=\left[\begin{array}{cc}2 & -1 \\ 1 & 1\end{array}\right]\) \(A^2=\left[\begin{array}{cc}2 & -1 \\ 1 & 1\end{array}\right]\left[\begin{array}{cc}2 & -1 \\ 1 & 1\end{array}\right]=\left[\begin{array}{cc}3 & -3 \\ 3 & 0\end{array}\right]\)…
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