Q .     The position vectors of `P` and `Q` are respectively `veca` and `vecb`. If `R` is a point on `vec(PQ)` such that `vec(PR)=5vec(PQ)`,then the position vector of `R` is

EAMCET 2008
A

`5vecb-4veca`

B

`5vecb+4veca`

C

`4vecb-5veca`

D

`4vecb+5veca`

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