If a, b, c are three vectors such that | a|=| c|=1, | b|=4, | b c|=2 and 2 b= c+ a then is

JEE Advanced Mathematics question

If are three vectors such that and then is

Answer: (A)

Let be the angle between and . , so or , i.e. . From \vec\vec$

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Question ID VK-109956