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The position vectors of the four angular...

The position vectors of the four angular points of a tetrahedron OABC are `(0, 0, 0), (0, 0, 2), (0, 4, 0) and (6, 0, 0)`, respectively. A point P inside the tetrahedron is at the same distance 'r' from the four plane faces of the tetrahedron. Then, the value of 9r is.....

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The correct Answer is:
`(6)`
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