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** Q 2611201120. ** A line passing through the point A with position vector `vec a = 4 hat i + 2 hat j + 2 hat k` is parallel to the vector `vec b = 2 hat i + 3 hat j + 6 hat k`. Find the length of the perpendicular drawn on this line from a point `P` with vector `vec r_1 = hat i + 2 hat j + 3 hat k`

**CBSE-12th 2015 **