Question

Which diagram represents the postulate that states exactly one line exists between any two points?

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Answer 1

The diagram is attached with this answer

Explanation:

In the diagram there are two points, point P and point Q. It is impossible to have more than one line between these points, so exactly one line exists between them.

Answer 2

Check attachment for the diagram

Explanation:

Given two points A and B in the diagram attached, we see that exactly one line exists between these points.