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[" 5.Show that the four points "A,B,C,D"...

[" 5.Show that the four points "A,B,C,D" with position vectors "vec a,vec b,vec c,vec d" respectively suchtio "],[3vec a-2vec b+5vec c-6vec d=vec 0," are coplanar.Also,find the position vector of the poitt "],[" intersection of the line segments "AC" and "BD" ."]

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