Answer
$$\langle -\frac{9}{2}, -\frac{3}{2}, 1\rangle.$$
Work Step by Step
$$\overrightarrow{ PQ}=Q-P=(-\frac{1}{2},\frac{9}{2},1)-(4,6,0)=\langle -\frac{9}{2}, -\frac{3}{2}, 1\rangle.$$
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