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The determinant of the matrix $$\begin{bmatrix}2 &0 &0 &0 \\ 8& 1& 7& 2\\ 2& 0&2 &0 \\ 9&0 & 6 & 1 \end{bmatrix}$$

1. 4
2. 0
3. 15
4. 20
edited | 502 views

$2*\begin{bmatrix} 1 & 7 & 2\\ 0 & 2 & 0\\ 0 & 6 & 1 \end{bmatrix} = 4$

+1 vote
2*1*2*1=4 break it into determinant of smaller pieces where you are doing it in such a way that you should have to do lesser number of operations
if we do nornally by cofactor method we get 20 as ans why that's not true?
+1 vote

2*1*2*1 = 4 so option A is right