4 points A,B,C and D are situated in a 3-dimensional space. In a certain spot, the coordinates of A, C and D are known:
A(1,1,1)
C(2,0,1)
D(0,3,0)
The coordinates of the barycentre of {A,B,C} are: (4/3, 1/3, 4/3).
a) Determine the coordinates of point B in the used spot.
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