If \( \left[\begin{array}{cc}1 / 25 & 0 \\ x & 1 / 25\end{array}\right]=\left[\begin{array}{cc}5...

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If \( \left[\begin{array}{cc}1 / 25 & 0 \\ x & 1 / 25\end{array}\right]=\left[\begin{array}{cc}5 & 0 \\ -a & 5\end{array}\right]^{-2} \), then the value of \( x \) is
(A) \( a / 125 \)
(B) \( 2 a / 25 \)
(C) \( 2 a / 125 \)
(D) None of these
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