Question: 4. (a) (2 marks) Let A be a square matrix that has a zero row. Prove that A is not invertible. (b) (2 marks) Let

4. (a) (2 marks) Let A be a square matrix that has a zero row. Prove that A is not invertible. (b) (2 marks) Let A be a square matrix that has a zero column. Prove that A is not invertible

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