Answer 1

cannot be found

The point which divides the join of (1, 2) and (3, 4) externally in the ratio 1 :1 is \[\left( \frac{1 \times 3 - 1 \times 1}{1 - 1}, \frac{1 \times 4 - 1 \times 2}{1 - 1} \right)\] which is not defined .
Therefore,it is not possible to externally divide the line joining two points in the ratio 1:1