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JEE Advance - Mathematics (1983 - No. 35)

The points z1, z2, z3, z4 in the complex plane are the vertices of a parallelogram taken in order if and only if
z1 + z4 = z2 + z3
z1 + z3 = z2 + z4
z1 + z2 = z3 + z4
None of these

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