The value of ( -1+i 3 2 )^n+ ( -1-i 3 2 )^n where n is not a multiple of 3 and i= -1 , is

NDA 2017 Mathematics question

The value of where n is not a multiple of 3 and , is

Answer: (B)

The two numbers are and , the complex cube roots of unity. When is not a multiple

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Question ID VK-028577