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In a quadrilateral P Q R S , vec P Q= ve...

In a quadrilateral `P Q R S , vec P Q= vec a , vec Q R , vec b , vec S P= vec a- vec b ,M` is the midpoint of ` vec Q Ra n dX` is a point on `S M` such that `S X=4/5S Mdot` Prove that `P ,Xa n dR` are collinear.

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