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Please help 8. (Strang 2.7.23) Find a 4 x 4 matrix, A, that requires 3 row exchanges (and no elimination steps) to reach an upper

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8. (Strang 2.7.23) Find a 4 x 4 matrix, A, that requires 3 row exchanges (and no elimination steps) to reach an upper triangular form, U. What are the factors (P, L, and U) of this matrix: PA = LU

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