1.

The points z_1, z_2, z_3, z_4 in the complex plane form the vertices of a parallelogram iff:

Answer»

`z_1+z_2=z_3+z_4`
`z_1+z_3=z_2+z_4`
`z_1+z_3gtz_2+z_4`
NONE of these

Answer :B


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