1.

If z_(k)=e^(i theta_k) for k= 1, 2, 3, 4 where i^(2)= -1, and if |sum_(k=1)^(4) (1)/(z_k)|=1, then |sum_(k=1)^(4)| is equal to

Answer»

`4`
`1`
`2`
`3`

ANSWER :B


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