Home Maths Complex Number Skill Builder If be an imaginary root of unity, then is…
Maths Complex Number Skill Builder Single Correct MCQ
Published on: August 13, 2026

If be an imaginary root of unity, then is equal to :

A
B

C
D
None of these

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Verified by Experts
The correct answer is:
C

Let

Since is an imaginary root of unity,

So,

Using the standard result (differentiate geometric series):

Hence,

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