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a) 4 b) 5 c) 2 d) 1. modern combat 5 pc windows 8 free Suppose that A is a 5×4 matrix with real entries such that Ax = 0, where x is a 4×1 vector and 0 is a null vector, then the rank of A is ? a) 4 b) 5 c) 2 d) 1 Problem 69E: Consider an mn matrix A and an np matrix B Show that the row vectors of AB are in the row space of