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

** Q 2167280185. ** Let the coordinates of `A, B, C` are `(1, 8, 4), (0,- 11, 4)`,

`(2,- 3, 1)` respectively. The coordinate of a point `D` which

is foot of the perpendicular from `A` on `BC` is `( 4, 5, - 2)`.