Consider the following augmented matrix: R₁: 1 0 R₂: R3: R₁: 1 -1 8 0 0 2 -1 -2 0 -4 1 0 4 0 30 4 1 Assume that the largest absolute values of each row before elimination are: $₁ = 2, 82 = 5, 83 = 6, 84 = 2 By using scaled partial pivoting strategy, which row should be used as pivot row to eliminate 27

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