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4. Let A be an n x n matrix such that A31 = On. (a) Show that In A is invertible. (b) Let B be
4. Let A be an n x n matrix such that A31 = On. (a) Show that In A is invertible. (b) Let B be an invertible n X n matrix. Is B A invertible? Provide a proof if yes, and a counterexample otherwise
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