No
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Not sure about complanar. Coplanar lines can be collinear but need not be.
no.
6*5/2 = 15.
5 its 4
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!