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ABCD  is a quadrilateral and  E  is t...

    ABCD  is a quadrilateral and  E  is the point of intersection of the lines joining the middle points of opposite side. Show that the resultant of            `vec (OA)        ,         vec(OB)        ,         vec(OC)         and         vec(OD)    `      = 4           ` vec(OE)`        ,  where  O  is any point.

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