If a and b are vectors such that | a + b| = 29 and a (2 i + 3 j + 4 k) = (2 i + 3 j + 4 k) b, then a possible value of ( a + b) (-7 i + 2 j + 3 k) is

JEE Advanced 2012 Mathematics question

If and are vectors such that and , then a possible value of is

Answer: (C)

Let . Then , so $ a + b =

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Question ID VK-026106