No. For example, consider the vertices of a tetrahedron (triangle-based pyramid).
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all of them are collinear they lie in the same plane
lie on the same plane and are collinear
No. For any three points it is always possible to find a plane on which they all lie. A fourth point is most unlikely to be coplanar with the first three unless it is deliberately placed to be so.
Yes, they are.
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