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If the centroid of a tetrahedron OABC is...

If the centroid of a tetrahedron OABC is (1, 2, -1) where A = (a, 2, 3), B = (1, b, 2), C = (2, 1, c) respectively, find the distance of P(a, b, c) from the origin.

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The correct Answer is:
`sqrt(107)`
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