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The vectro vec(AB)= 3 hatj + 4 hatk and ...

The vectro `vec(AB)= 3 hatj + 4 hatk and vec(AC) = 5 hati - 2 hatj + 4 hatk` are the sides of a triangle ABC. The length of the medium through A is :

A

`sqrt(72)`

B

`sqrt(33)`

C

`sqrt(288)`

D

`sqrt(18)`

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The correct Answer is:
B
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