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A linepasses through the points whose po...

A linepasses through the points whose positions vectors `hati+hatj-2hatk` and `hati-3hatj+hatk`. The position vector of a point on it at a unit distance from the first point is (A) `hati-hatj+3hatjk` (B) `1/5(4hati+9hatj-13hatk0` (C) `1/5(6hati+hatj-7hatk)` (D) none of these

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