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Let z1 and z2 be the nth roots of unity ...

Let `z_1` and `z_2` be the nth roots of unity which subtend a right angle at the origin then n must be the form

A

4k+1

B

4k+2

C

4k+3

D

4k

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The correct Answer is:
D
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PATHFINDER-COMPLEX NUMBER-QUESTION BANK
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