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In each of the following case, verift wh...

In each of the following case, verift whether the four given points are coplanar or not. `(1,2,3),(-1,1,10),(2,1,3),(1,1,2)`

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As `|(-1-1,1-2,0-3),(2-1,1-2,3-3),(1-1,1-2,2-3):|=|(-2,-1,-3),(1,-1,0),(0,-1,-1):|=-2(1-0)-1(1-3)=-2+2=0`
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