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** Q 2105291168. ** A variable plane which remains at a constant distance `p`

from the origin cuts the coordinate axes in `A, B, C`. The

locus of the centroid of the tetrahedron `OABC` is

`y^2 z^2 + z^2x^2 +x^2y^2 = lx^2 y^2 z^2`, where `k` is equal to