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If vec(DA)=veca,vec(AB)=vecb and vec(CB)...

If `vec(DA)=veca,vec(AB)=vecb and vec(CB)=kveca where kgt0` and X,Y are the midpoint of DB and AC respectively such that `|veca|=17 and |vec(XY)|=4,` then k is equal to (A) `9/17` (B) `8/17` (C) `25/17` (D) `4/17`

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