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Mathematics 42 Online
OpenStudy (anonymous):

Let A=[1 1 2 3(1st column), 1 2 3 4(2nd column), 1 2 4 5(3rd column)] and let B be the row-reduced echelon form of A. How many non-zero entries are there in the fourth column of matrix B?

OpenStudy (anonymous):

|dw:1382668040716:dw|

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