The point which divides the join of (1, 2) and (3, 4) externally in the ratio 1 : 1
cannot be found
The point which divides the join of (1, 2) and (3, 4) externally in the ratio 1 : 1 is
(1×3−1×11−1,1×4−1×21−1)
Which is not defined.
Therefore, it is not possible to externally divide the line joining two points in the ratio 1 : 1