Question: Does the point D(-8,3,5) lies on the same plane as A(3,-1,-2), B(2,2,4) and C(4,-1,-3). and how would we know if they lie on the same

Does the point D(-8,3,5) lies on the same plane as A(3,-1,-2), B(2,2,4) and C(4,-1,-3).

and how would we know if they lie on the same plane?

Also why in R^3 three points must always be coplanar but 4 points may not be?

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