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If `vec(a)` and `vec(b)` are the vectors such that `|vec(a)|=3sqrt(3), |vec(b)|=4` and `|vec(a)+vec(b)|=sqrt(7)`, then the angle between `vec(a)` and `vec(b)` is

A

`120^(@)`

B

`60^(@)`

C

`30^(@)`

D

`150^(@)`

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The correct Answer is:
A
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