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If $\begin{vmatrix} 6 {i} & - 3 {i} & 1 \\ 4 & 3 {i} & -1 \\ 20 &3 & i \end{vmatrix} = x + i y$, then :


( A ) $x = 0, y = 0$
( B ) $x=0, y=3$
( C ) $x = 1, y=3$
( D ) $x=3, y=1$

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