Determinants 2

Level pending

After finding the determinant of a 2 by 2 matrix, next will be a 3 by 3... There is a formula to it, known as Sarrus' Rule. Find \[det \left( \begin{array}{ccc}1 & 2 & 3\\4 & 5 & 6\\ 7 & 8 & 9\end{array} \right)\]

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