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matrices help?

Let A=

1 1 2 3

1 2 3 4

1 2 4 5

and let B be the row reduced echelon form of A. How many non-zeros entries are there in the fourth column of matrix B?

1 Answer

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  • 7 months ago

    Two.

    The rref is:

    1 0 0 1

    0 1 0 0

    0 0 1 1

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