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Question
Evaluate the following determinant:
$$ det \left( \begin{matrix}3&6&-1&2\\5&9&-4&3\\-2&-1&8&11\\4&-2&-6&12\end{matrix} \right) $$
Answer
$$ det \left( \begin{matrix}3&6&-1&2\\5&9&-4&3\\-2&-1&8&11\\4&-2&-6&12\end{matrix} \right) = 622 $$
Explanation
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