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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 `(2veca+vecb)and(veca-3vecb)` externally in the ratio `1:2` Also , show that P is the mid point of the line segment RQ.

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The correct Answer is:
`3veca+5vecb`
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