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

माना \(A =\left[\begin{array}{lll}1 & 0 & 0 \\ 1 & 1 & 0 \\ 1 & 1 & 1\end{array}\right]\) तथा \(B = A ^{20}\) है, तो \(B\) के प्रथम स्तंभ के अवयवों का योगफल है

  1. A \(211\)
  2. B \(210\)
  3. C \(231\)
  4. D \(251\)
Verified Solution

Answer & Solution

Correct Answer

(C) \(231\)

Step-by-step Solution

Detailed explanation

Here \(A = \left[ {\begin{array}{*{20}{c}} 1&0&0\\ 1&1&0\\ 1&1&1 \end{array}} \right]\) \(\therefore {A^2} = A.A = \left[ {\begin{array}{*{20}{c}} 1&0&0\\ 1&1&0\\ 1&1&1 \end{array}} \right] \times \left[ {\begin{array}{*{20}{c}} 1&0&0\\ 1&1&0\\ 1&1&1 \end{array}} \right]\)…
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