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The locus of point such that the sum of ...

The locus of point such that the sum of the squares of its distances from the planes `x+y+z=0, x-z=0 and x-2y+z=0` is 9 is (A) `x^2+y^2+z^2=3` (B) `x^2+y^2+z^2=6` (C) `x^2+y^2+z^2=9` (D) `x^2+y^2+z^2=12`

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