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If (3,2,-1),(4,1,1) and (6,2,5) are thre...

If (3,2,-1),(4,1,1) and (6,2,5) are three vertices and (4,2,2) is the centroid of a tetrahedro, find the fourth vertex to that tetrahedron.

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The correct Answer is:
(3,3,3)
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