JEE Main 2003 Mathematics question

Mathematics Vector Algebra JEE Main 2003

are 3 vectors, such that , , | then is equal to

(1)1
(2)0
(3)−7Correct
(4)7

Answer: (3)

Solution

With : \vec\vec\vec\vec\vec\vec\vec\vec\vec\vec$

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Question ID VK-038274