Question: 3. True or False. (a) Square matrix A is invertible if and only if its null space is trivial. (b) A wide matrix (more columns

3. True or False. (a) Square matrix A is invertible if and only if its null space is trivial. (b) A wide matrix (more columns than rows) can never have a trivial null space. (c) A long matrix (more rows than columns) can never have a trivial null space. (d) For all matrices, the null space is never equal to the column space

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