JEE Main 2013 Mathematics question

Mathematics Vector Algebra JEE Main 2013

If â, b̂ and ĉ are unit vectors satisfying , then the angle between the vectors â and ĉ is :

(1)
(2)Correct
(3)
(4)

Answer: (2)

Solution

$ a + c = 3 b ⇒ | a + c|^2 = 3 ⇒ 2 + 2

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Question ID VK-104072