1.

Consider the planes p_1: 2x+y+z+4=0, p_2: y-z+4=0 and p_3: 3x+2y+z+8=0 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. Then.

Answer»

at LEAST two of the line `L_1, L_2 and L_3` are non parallel.
at least two of the LINES `L_1, L_2 and L_3` are parallel
the three PLANES INTERSECT in the line.
the three planes form a triangular prism.

Answer :(B, c)


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