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12th Class Mathematics Sample Paper Mathematics Olympiad - Sample Paper-4

  • question_answer
    Lf \[\mathbf{A}=\left[ \begin{align}   & 1\,\,\,2 \\  & 2\,\,\,1 \\ \end{align} \right]\]then adj. of A is equal to:

    A) \[\left[ \begin{align}   & -1\,\,\,2 \\  & 2\,\,\,-1 \\ \end{align} \right]\]                    

    B) \[\left[ \begin{align}   & -1\,\,\,-2 \\  & -2\,\,\,-1 \\ \end{align} \right]\]     

    C) \[\left[ \begin{align}   & 2\,\,\,1 \\  & 1\,\,\,1 \\ \end{align} \right]\]                    

    D) \[\left[ \begin{align}   & 1\,\,\,-2 \\  & -2\,\,\,1 \\ \end{align} \right]\]

    Correct Answer: D

    Solution :

    [d] \[A=\left[ \begin{align}   & 1\,\,\,\,2 \\  & 2\,\,\,\,1 \\ \end{align} \right]\] Adjoint of \[A=\left[ \begin{align}   & 1\,\,\,\,-2 \\  & -2\,\,\,\,1 \\ \end{align} \right]\]


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