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Let overlinea=2overlinei+4overlinej-5ove...

Let `overlinea=2overlinei+4overlinej-5overlinek,overlineb=overlinei+overlinej+overlinek,overlinec=overlinej+2overlinek`. Find the unit vector in the opposite direction of `overlinea+overlineb+overlinec`

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Show that the four points -overlinea+4overlineb-3overlinec,3overlinea+2overlineb-5overlinec,-3overlinea+8overlineb-5overlinec,-3overlinea+2overlineb+overlinec are coplanar, where overlinea,overlineb,overlinec are non-coplanar vectors.