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1. (a) For each of the following matrices, explain why it is not in reduced row echelon form. -4 5 4 O A = 0

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1. (a) For each of the following matrices, explain why it is not in reduced row echelon form. -4 5 4 O A = 0 0 -1 0 O O 0 0 0 ii. -2 O O B = 1 0 -1 -2 O O 0 0 ili. 1 3 1 C = 0 5 -15 10 OUT 0 0 0 0 (b) Show step by step why 2 N O O HO HO RREF -1 2 4 0 0 ON O O O 1 -2 CO

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