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Q 1267534485.     Consider three planes
`P_1 : x - y + z = 1`
`P_2 : x + y - z = -1` and `P3 : x - 3y + 3z = 2`
Let `L_1, L_2, L_3` be the lines of intersection of the planes `P_2` and `P_3`, `P_3` and `P_1,P_1` and `P_2`, respectively.
Statement I: At least two of the lines `L_1, L_2` and `L_3` are non-parallel.
Statement II: The three planes do not have a common point.
(Provided By a Student and Checked/Corrected by EXXAMM.com Team)