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find pivot positions and columns

📌 What the video covers **Pivot positions**: Explains how to identify pivot positions in a matrix when performing row reduction. **Pivot columns**: Shows how pivot positions determine which columns are pivot columns. **Step‑by‑step demonstration**: Walks through examples of matrices, applying row operations to highlight pivots. **Connection to echelon form**: Links the idea of pivots to the process of putting a matrix into echelon or reduced echelon form. **Applications**: Notes how pivot columns are used in solving systems of linear equations and determining matrix rank.