The position vector of a point R which d...

The position vector of a point R which divides the line joining two points P and Q whose position vectors are `overset(^)i+2overset(^)j-overset(^)k and - overset(^)i+overset(^)j-overset(^)k` respectively, in the ratio `2:1` externally is

`-3overset(^)i-overset(^)k`

`3overset(^)i+overset(^)k`

`2overset(^)i+overset(^)j-overset(^)k`

None of these

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