If a and b are vectors in space given by a = i - 2 j 5 and b = 2 i + j + 3 k 14 , then the value of (2 a + b ) [ ( a b ) ( a - 2 b ) ] is

JEE Advanced 2010 Mathematics question

If and are vectors in space given by and , then the value of is

Answer: 5

, and . Using with , , $ w = a - 2

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Question ID VK-025782