A plane passes through the points A(1, 2, 3), B(2, 3, 1) and C(2, 4, 2). If O is the origin and P is (2, -1, 1), then the projection of on this plane is of length :
Option: 1
Option: 2
Option: 3
Option: 4
Equation of the plane passing through the point A(1, 2, 3), B(2, 3, 1) and C(2, 4, 2) is
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