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False. Over constrained, and not defining a single flat plane of the form:

Ax+By+Cz+D=0

Wolfram-Alpha inputs for the first 3 and last 3 sets of coordinates:

plane through (1,3,1) and (1,1,-1) and (-1,1,1)

plane through (1,1,-1) and (-1,1,1) and (1,2,1)

define different equations => different planes => therefore all 4 points do NOT lie on a common plane.

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13y ago
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Q: Prove that the four points 1 3 1 and 1 1 -1 and -1 1 1 and 1 2 1 are lying on the same plane?
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