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If O is the origin and A,B are the point...

If O is the origin and A,B are the points (2,1,-3) and (1,1,1) respectively then the angle between `vecOA` and `vecOB` is:

A

`45^(@)`

B

`90^(@)`

C

`60^(@)`

D

`30^(@)`

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The correct Answer is:
B
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