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If `vec(a),vec(b)` and `vec(c)` are unit vectors such that `vec(a)+vec(b)+vec(c)=0`, then `3vec(a).vec(b)+2vec(b).vec(c)+vec(c).vec(a)=`

A

3

B

-3

C

1

D

-1

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The correct Answer is:
B
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