JEE Main & Advanced Mathematics Determinants & Matrices Question Bank Special types of matrices, Transpose, Adjoint and Inverse of matrices

  • question_answer
    If A is a skew symmetric matrix and n is a positive integer, then \[{{A}^{n}}\]is

    A) A symmetric matrix

    B) Skew-symmetric matrix

    C) Diagonal matrix

    D) None of these

    Correct Answer: D

    Solution :

    Since A is a skew-symmetric matrix, therefore      \[{{A}^{T}}=-A\Rightarrow {{({{A}^{T}})}^{n}}={{(-A)}^{n}}\]\[\Rightarrow \]\[{{({{A}^{n}})}^{T}}=\left\{ \begin{align}   & {{A}^{n}}\text{, if }n\,\text{is even} \\  & -{{A}^{n}}\text{, if }n\text{ is odd} \\ \end{align} \right.\]


You need to login to perform this action.
You will be redirected in 3 sec spinner