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

ધારોકે \(A =\left(\begin{array}{cc}2 & -1 \\ 0 & 2\end{array}\right)\). જો \(B = I -{ }^{5} C _{1} (\operatorname{adj} A )+{ }^{5} C _{2}\) \((\operatorname{adjA})^{2}-\ldots-{ }^{5} C _{5} (\operatorname{adj} A )^{5}\),તો શ્રેણીક \(B\)નાં તમામ ઘટકોનો સરવાળો \(\dots\dots\dots\) છે.

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