If 2 points determine a line, then a line contains infinitely many planes.
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Infinitely many planes contain any two given points- it takes three (non-collinear) points to determine a plane.
Given a line, there are an infinite number of different planes that it lies in.
Exactly one.
Only one plane can contain three specific points.
If the points are collinear, that means there's only one straight line. An infinite number of different planes can be drawn that contain one straight line.