then the dimension of AB is and the dimension of BA is 3 -7 -4 -7 -2 7 -9 A = -2 7 -5 -1 JI -4-6 -1 9 9 -6 3 4 -5-2 5 B= [9 -1 9 1 1 -3 1] TT-TTI

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