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If a,b,c are unit vectors such that a + ...

If a,b,c are unit vectors such that a + b + c = 0 then a.b + b.c + c + c . A=

A

`(3)/(2)`

B

`-(3)/(2)`

C

`(1)/(2)`

D

`-(1)/(2)`

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The correct Answer is:
B
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