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Let A(x(1),y(1),z(1)),B(x(2),y(2),z(2)) ...

Let `A(x_(1),y_(1),z_(1)),B(x_(2),y_(2),z_(2))` and `C(x_(3),y_(3),z_(3))` be the vertices of `DeltaABC`.
i. Find the midpoint D of BC.
ii. Find the coordinates of the centroid of `DeltaABC`.

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