Let A be the matrix: [1 2 0 3] [0 0 0 0] [0 0 1 2] Is A in RREF?

I've taken two upper division courses in linear algebra, and yet a trivial problem has arisen that I am having trouble answering! haha

Let A be the matrix:

[1 2 0 3]
[0 0 0 0]
[0 0 1 2]

Is A in RREF? I say yes, however, the majority of students whose papers I am grading say no. If they are correct, what is the reason?

TIA,
Ryan
 

matt grime

Science Advisor
Homework Helper
9,394
3
the row of zeroes should be on the bottom.
 

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