If a, b and c are three unit vectors with b and c being non-parallel, such that a (b….

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If a, b and c are three unit vectors with b and c being non-parallel, such that a  (b  c) = (1/2) b, then the angle between 

Options :-

1. a and c is /3
2. a and c is /2
3. a and b is /3
4. a and b is /6

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