$\begin{bmatrix} 1 \\ -1 \\ 2 \end{bmatrix} \begin{bmatrix} 2 & 1 & -1 \end{bmatrix} = $

  • A
    $[-1]$
  • B
    $\begin{bmatrix} 2 \\ -1 \\ -2 \end{bmatrix}$
  • C
    $\begin{bmatrix} 2 & 1 & -1 \\ -2 & -1 & 1 \\ 4 & 2 & -2 \end{bmatrix}$
  • D
    Not defined

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