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If the position vectors of points A and ...

If the position vectors of points A and B are respectively `(1,2,-3) and (-1,-1,3)`, then unit vector along `vec(AB)` is

A

`hatj`

B

`-(2)/(7)hati-(3)/(7)hatj+(6)/(7)hatk`

C

`2hati+3hatj-6hatk`

D

none of these

Text Solution

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The correct Answer is:
B
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