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

** Q 2309067818. ** If the line through the points `A (k, 1, -1)` and

`B (2k, 0, 2)` is perpendicular to the line through the

points `B` and `C(2 + 2k, k, 1)`, then what is the value

of `k`?

**NDA 2010 Paper 1 **