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Show that points with p.v bar(a)-2bar(b)...

Show that points with p.v `bar(a)-2bar(b)+3bar(c ),-2bar(a)+3bar(b)-bar(c ),4bar(a)-7bar(b)+7bar(c )` are collinear. It is given that vectors `bara,barb,bar c` are non-coplanar.

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