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

`hat i + hat j `

B

`hat i - hat j`

C

`2 hat i + hat j - hat k`

D

`hat i + hat j + hat k`

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The correct Answer is:

B

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