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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 `hat(i) + 2hat(j) - hat(k)` and `-hat(i) + hat(j) + hat(k)` respectively in the ration 2:1
externally

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The correct Answer is:
`-3hat(i) + 3hat(k)`
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