If a, b, c are three unit vectors such that a+b+c=0, then a . b+b . c+c . a is equal to (1) -1 (2...

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If a, b, c are three unit vectors such that a+b+c=0, then a . b+b . c+c . a is equal to
(1) -1
(2) 3
(3) 0
(4) -3/2

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