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Mathematics
Problem
Find the value of the determinant
∣
1
2
4
3
4
9
2
−
1
6
∣
\begin{vmatrix} 1 & 2 & 4 \\ 3 & 4 & 9 \\ 2 & -1 & 6 \end{vmatrix}
1
3
2
2
4
−
1
4
9
6
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