On the augmented matrix A below, perform all three row operations in the order given, ((a) followed by (b) followed by (c)) and then write the resulting augmented matrix. (a) R₂ = -3r₁ +r₂ (b) R3 = 4r₁ +r3 (c) R3 = 3r2+r3 A = 1 3 -4 -1 -2 1 4 6 2 6 -1 818

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