The complex numbers z1 , z2, z3 are the vertices A, B, C of a parallelogram ABCD, then the fourth vertex D is
The complex numbers z1 , z2, z3 are the vertices A, B, C of a parallelogram ABCD, then the fourth vertex D is
(1) 1/2(z1+z2)
(2) 1/4(z1+z2+z3+z4)
(3) 1/2(z1+z2+z3)
(4) z1+z3-z2
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