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If $A = \begin{bmatrix} 1 & 5 \\ 6 & 2 \end{bmatrix}$ and $B= \begin{bmatrix} 3 & 7 \\ 8 & 4 \end{bmatrix}, \: AB^T$ is equal to

  1. $\begin{bmatrix} 38 & 28 \\ 32 & 56 \end{bmatrix}$
  2. $\begin{bmatrix} 3 & 40 \\ 42 & 8 \end{bmatrix}$
  3. $\begin{bmatrix} 43 & 27 \\ 34 & 50 \end{bmatrix}$
  4. $\begin{bmatrix} 38 & 32 \\ 28 & 56 \end{bmatrix}$
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