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If centroid of tetrahedron OABC, where A, B, C are given by (a, 2, 3), (1, b, 2) and (2, 1, c) respectively be (1, 2, -1), then distance of P(a, b, c) from origin is equal to (where O is origin)
(a)
(b)
(c)
(d)None of these

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Important Questions on Three Dimensional Geometry
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A line in the -dimensional space makes an angle with both the and axes. Then, the set of all values of is in the interval :

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