C1W2: Gaussian Elimination Assignment | Back Substitution Error

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This is with reference to the new assignment from Week 2 of Course 1 where students are implementing a back substitution method as part of Gaussian Elimination.

The given example is unclear. I have tried both R1 values (see attached image) but I don’t end up with the same R0. Can the admin extend this example and clarify?

I have solved this. A tiny typo in the notebook wasted 2days of my time sadly :frowning:

The error has already been reported to the course staff, hopefully it will be fixed soon.