If the position vectors of two points $A$ and $B$ are $\vec{a} - 3\vec{b}$ and $6\vec{b} - 2\vec{a}$ respectively,then the position vector of the point dividing $AB$ in the ratio $1 : 2$ is:

  • A
    $\vec{a}$
  • B
    $\frac{\vec{a} + \vec{b}}{3}$
  • C
    $\vec{0}$
  • D
    $\frac{\vec{a} - \vec{b}}{3}$

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