If \( A=\left[\begin{array}{lll}0 & 1 & 2 \\ 1 & 2 &amp...

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If \( A=\left[\begin{array}{lll}0 & 1 & 2 \\ 1 & 2 & 3 \\ 3 & a & 1\end{array}\right] \) and \( A^{-1}=\left[\begin{array}{ccc}1 / 2 & 1 / 2 & 1 / 2 \\ -4 & 3 & c \\ 5 / 2 & -3 / 2 & 1 / 2\end{array}\right] \), then the values of \( a \) and \( c \) are equal to
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