Linear Algebra: REF and RREF

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In this video, we talk about REF (Row Echelon form) and RREF (Reduced Row Echelon form) and how this is related to a system of equations.

00:00 - Introduction
00:09 - Defining REF and RREF
06:04 - Example 1
11:26 - Example 2
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Sorry I didn't quite understand the explanation of the leading 1s for the last RREF example. I'm still confused about how to justify the last row.

smayansharma