1. Which of the following matrix multiplications make sense? Evaluate the ones that do make sense. (b) (4) ₁) (!) 2 -1 (d) (2 (312) (8 :) 0 30 02 (c) (-1 -1 0 1 ) 100 2 0 1 -1 3 0 1 0-1 0 -1 00 4) 2 2 4 -1 20 0 0 1 0-1 000 3 101

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