Question: In Problems 512, two matrices A and B are given. Calculate whichever of the matrices AB and BA is defined. A = [ 4 }

In Problems 5–12, two matrices A and B are given. Calculate whichever of the matrices AB and BA is defined.

A = [ 4 } ] B = [ , 3 21

A = [ 4 } ] B = [ , 3 21 -1 0 3-2 4 45

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