Question 132

If $$A =\begin{bmatrix} 1 & 2 & 3 \\ 0 & 1 &  2 \\ 0 & 0 & 1 \end{bmatrix}, B =\begin{bmatrix} x \\ y \\  z \end{bmatrix} $$ and $$ AB =\begin{bmatrix} 6 \\  3 \\ 1 \end{bmatrix}$$,  then $$x + y + z = $$

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