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If D,E and F are the mid-points of the sides BC, CA and AB respectively of a triangle ABC and `lambda` is scalar, such that `vec(AD) + 2/3vec(BE)+1/3vec(CF)=lambdavec(AC)`, then `lambda` is equal to

A

`1/2bar(AC)`

B

`2bar(AC)`

C

`4bar(AC)`

D

`6bar(AC)`

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The correct Answer is:
A
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