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L and M are two points with position vec...

L and M are two points with position vectors `2vec(a)-vec(b)andvec(a)+2vec(b)`, respectively. The position vector of the pont N which divides the line segment LM in the ratio 2:1 externally is

A

`3 bar b `

B

`4 bar b`

C

` 5 bar b `

D

`3 bar a + 4 bar b `

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The correct Answer is:
C
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