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

माना \(A =\left(\begin{array}{cc}2 & -1 \\ 0 & 2\end{array}\right)\) है। यदि \(B = I -{ }^5 C _1(\operatorname{adj} A )+\) \({ }^5 C _2(\operatorname{adj} A )^2-\ldots-{ }^3 C _5(\operatorname{adj} A )^3\) है, तो आव्यूह \(B\) के सभी अवयवों का योगफल है

  1. A \(-5\)
  2. B \(-6\)
  3. C \(-7\)
  4. D \(-8\)
Verified Solution

Answer & Solution

Correct Answer

(C) \(-7\)

Step-by-step Solution

Detailed explanation

\(B =( I -\operatorname{adjA})^{5}=\left[\begin{array}{cc} -1 & -1 \\ 0 & -1 \end{array}\right]^{5}=\left[\begin{array}{cc} -1 & -5 \\ 0 & -1 \end{array}\right]\) Sum of its all elements \(=-7\).
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