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[" Find the virection ratio sol the vector "a=l+f-2k" and hence calculate its direction "],[" find the vector joining the points "P(2,3,0)" and "Q(-1,-2,-4)" directed from "P" to "Q" ."],[" Consider two points "P" and "O" with position vectors "vec OP=3vec a-2vec b" and "vec OO=vec a+vec b" .Find "]

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