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Walls
Age 16 to 18
Challenge Level 
Let $P_1$ be a plane through the points $A(2,1,0), B(1,1,1)$ and $C(1,7,3)$ and $P_2$ be a plane through the points $A$, $B$ and $V(x,y,z)$.
Find all the points $V(x,y,z)$ such that the two planes are perpendicular.
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