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Gaussian Elimination with Partial Pivoting

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Solve the following system using Gaussian elimination with partial pivoting:
|1 -1 2 |---- |x1|-----|-2 |
|-2 1 -1 |--- |x2|--=-| 2 |
|4 -1 2 |-----|x3|----|-1 |

Show intermediate matrices, vectors and multipliers at each step.

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Gaussian Elimination with Partial Pivoting is applied.

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1) Interchange row1 and ...

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