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In ` triangle A B C ,` a point `P` is taken on `A B` such that `A P//B P=1//3` and point `Q` is taken on `B C` such that `C Q//B Q=3//1` . If `R` is the point of intersection of the lines `A Qa n dC P ,` using vector method, find the area of ` A B C` if the area of ` B R C` is 1 unit

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