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Show that the co-ordinates of two points...

Show that the co-ordinates of two points P and Q on a line passing through a fixed point A `(x_(1), y_(1),z_(1))`, having line d.cs l,m,n and at a distance r units from A are P (or) Q = `(x_(1)pmlr,y_(1)pmmr,z_(1)pmnr)`

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