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                                    A variable plane intersects the coordinate axes at A,B,C and is at a constant distance p from O(0,0,0). Then the locus of the centroid of the tetrahedron OABC is | 
                            
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Answer»  A variable plane intersects the coordinate axes at A,B,C and is at a constant distance p from O(0,0,0). Then the locus of the centroid of the tetrahedron OABC is  | 
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