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If vec(a),vec(b) and vec(c) are unit vec...

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

1

B

`-1`

C

3

D

`-3`

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The correct Answer is:
D
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