If $z = \begin{bmatrix} 1 & 1+2i & -5i \\ 1-2i & -3 & 5+3i \\ 5i & 5-3i & 7 \end{bmatrix}$,then which of the following is true? (where $i = \sqrt{-1}$)

  • A
    $z$ is purely real
  • B
    $z$ is purely imaginary
  • C
    $z + \bar{z} = 0$
  • D
    $(z - \bar{z})i$ is purely imaginary

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Let the minimum $m$ $(m \in Z^+)$ be defined as the power of a square matrix $A$ such that $A^m = I$. If $A^5 = I$ and $ABA^{-1} = B^2$,then the power of matrix $B$ such that $B^k = I$ is between:

Let $A$ and $B$ be two symmetric matrices of order $3$.
Statement $-1$: $A(BA)$ and $(AB)A$ are symmetric matrices.
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Which of the following statements is correct about two square matrices $A$ and $B$ of the same order $n$?

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