CBSE - IX - Mathematics - Coordinate Geometry
how many planes can be pass through (1). 3 collinear points (2). 3 non-collinear points
If, on the other hand, the points are not collinear, then the plane has no wriggle room: it is stuck fast in one place - there can be only one plane containing all the points. Provided they are non-collinear, three points will define a single plane.
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