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If the points A and B are (1,2,-1) and (...

If the points A and B are (1,2,-1) and (2,1,-1) respectively, then `vec(AB)` is

A

`hati+hatj`

B

`hati-hatj`

C

`2hati+hatj-hatk`

D

`hati+hatj+hatk`

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