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Which of the matrices that follow are in row echelon form ref Which are i reduced row echelon form rref 100 1 30 1 2

Which of the matrices that follow are in row echelon form ref Which are i reduced row echelon form rref 100 1 30 1 2 3 4 A 6 6 9 B 000 C 001 0012 0 0 1 000 9 9

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