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Let z1 and z2 be n^(th) roots of unity w...

Let `z_1 and z_2` be `n^(th)` roots of unity which subtend a right angle at the origin. Then n must be of 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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