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

ધારોકે \(A=\left[\begin{array}{cc}2 & -1 \\ 1 & 1\end{array}\right]\). જો \(A^{13}\) નાં વિકર્ણી ધટકોનો સરવાળો \(3^n\) હોય, તો \(n\) = ...............

  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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