Question: Let A be a non zero 5 3 matrix. Select all true statements: a) AT A and AAT are both symmetric. b) AAT is invertible.

Let A be a non zero 5 3 matrix. Select all true statements: a) AT A and AAT are both symmetric. b) AAT is invertible. c) AT A is invertible. d) At least one of AAT or AT A is invertible

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