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If vec a , vec ba n d vec c are non-cop...

If ` vec a , vec ba n d vec c` are non-coplanar vectors, prove that the four points `2 vec a+3 vec b- vec c , vec a-2 vec b+3 vec c ,3 vec a+` 4` vec b-2 vec ca n d vec a-6 vec b+6 vec c` are coplanar.

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