UPSC NDA II 2018 Mathematics Solved Paper

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Question : 15 of 120
 
Marks: +1, -0
What is the value of
(‌‌
−1+i√3
2
)
3n
+(‌‌
−1−i√3
2
)
3n
where i=√−1 ?
[NDA II 2018]
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