What rows or columns or matrices do you multiply to find (a) the third column of AB? (b)
Chapter 1, Problem 1.4.40(choose chapter or problem)
What rows or columns or matrices do you multiply to find (a) the third column of AB? (b) the first row of AB? (c) the entry in row 3, column 4 of AB? (d) the entry in row 1, column 1 of CDE?
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