I have a feeling that I'm wrong but i guess that 2 planes can pass through 2 points
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Only one plane can pass through 3 non-collinear points.
Infinitely many planes may contain the same three collinear points if the planes all intersect at the same line.
That is a plane.Any one of infinitely many planes.
exactly one and only one.
exactly nine planes! * * * * * I would have said 4 - corresponding to the four faces of a tetrahedron. Of course, non-collinear does not mean non-coplanar so all four points could be in the same single plane!