If a and b are position vectors of A and...

If a and b are position vectors of A and B respectively the position vector of a point C on AB produced such that `vec(AC)=3 vec(AB)` is

A

`3vecb-2veca`

B

`2veca-3vecb`

C

`2veca+3vecb`

D

`3veca-2vecb`

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