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P(0, 3, -2), Q(3, 7, -1) and R(1, -3, -1...

`P(0, 3, -2), Q(3, 7, -1) and R(1, -3, -1)` are 3 given points. Find `vec (PQ)`

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`(A) to r (B) to q, (C) to p D to s`
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