Two matrices A and B are given. Calculate whichever of the matrices AB and BA is defined. \begin{bmatrix} 4 & 0 & -5 \\ 3 & -2 & 6 \end{bmatrix}, B = \begin{bmatrix} 5 & 3 \\ -7 & 0 \\ 3 & -4 \end{bmatrix}
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