I have a matrix 4x4:(adsbygoogle = window.adsbygoogle || []).push({});

1,2,3,4

2,6,6,6

0,0,1,13

0,0,0,1

I need to find determinant. I am getting det=6.

When I use online matrix calculator it gives me det=2.

I tried reduce second row (2 row - 1(1 row)) and I got det=2

I'm confused. Why calculator gives me different answer?

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# Homework Help: Matrix determinant

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