$$\frac{ 1 }{ 6 } [6(x-2)(x-1)]$$
$\left(x-2\right)\left(x-1\right)$
$$\left(x-2\right)\left(x-1\right)$$
$$x^{2}-x-2x+2$$
$$x^{2}-3x+2$$
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$x^{2}-3x+2$