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If barp + barq + barr = bar0 , |barp|= 3...

If `barp + barq + barr = bar0 , |barp|= 3,|barq| = 5, |barr|=7` . Then angle between `barp and barq` is

A

`pi//16`

B

`2pi//3`

C

`pi//6`

D

`pi//3`

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The correct Answer is:
D
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