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Find the position vector of a point R wh...

Find the position vector of a point `R` which divides the line joining two points `P` and `Q` whose position vectors are `(2\ vec a+ vec b)` and (` vec a-\ 3 vec b)` respectively, externally in the ratio 1:2.Also, show that `P` is the mid-point of the line segment `R Qdot`

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