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### Question Asked by a Student from EXXAMM.com Team

** Q 2359156014. ** If the equation to sphere passing through origin

and the points `(-1, 0, 0), (0,- 2, 0)` and `(0, 0,-3)` is

`x^2 + y^2 + z^2 + f(x, y, z) = 0`, then what is

`f(x,y,z)` equal to?

**NDA 2011 Paper 1 **