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4. Let A = 121] 2 2 1 and B = 1 3 2 (if possible) the following: (a) The entry (AB) 22 of

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4. Let A = 121] 2 2 1 and B = 1 3 2 (if possible) the following: (a) The entry (AB) 22 of AB. (b) The entry (BA) 22 of BA. (c) Column 2 of AB. (d) Row 3 of BA. 69 4 3 Without calculating the complete matrices AB and BA, compute

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