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

`3bara-barb`

B

`3barb-bara`

C

`3bara-2barb`

D

`3barb-2bara`

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The correct Answer is:

A

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