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A(2, 4, 2), B(1, 2, 1), C(4, 3, -1) and ...

A(2, 4, 2), B(1, 2, 1), C(4, 3, -1) and D are the vertices of a parallelogram ABCD. Then find the position vector of the point D.

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`5bar(i)+5bar(j)`
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