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If the position vectors of the points `A and B` are `hati+3hatj-hatk` and `3hati-hatj-3hatk,` then what will be the position vectors of the mid point of `AB`

A

`hati+2hatj-hatk`

B

`2hati+hatj-2hatk`

C

`hati+hatj-hatk`

D

`hati+hatj-2hatk`

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The correct Answer is:
B
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