e) Find determinant | 2 -1 2| | 1 2 1| | -1 1 1|
usehttps://www.mathsisfun.com/algebra/matrix-determinant.html
e) Find determinant | 2 -1 2| | 1 2 1| | -1 1 1| use https://www.mathsisfun.com/algebra/matrix-determinant.html
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