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If the fourth roots of unity are z1,z2,z...

If the fourth roots of unity are `z_1,z_2,z_3,z_4` then `z_1^2+z_2^2+z_3^2+z_4^2` is equal to

A

1

B

0

C

i

D

none of these

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The correct Answer is:
B
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