As long as at least two of them are different points, exactly one line.
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Any three non-collinear points will define a single plane. A plane is composed of an infinite number of distinct lines.
Three
only 1 lines can contain 3 collinear points. Maybe you mean coplanar?
7.
No. Collinear means on the same line. So collinear points all must lie on the same line. Not parallel lines.