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Questions  

The condition for the points  z1,z2, z3, z4  taken in order in the Argand plane to be the vertices of a parallelogram is

a
z1+z2=z3+z4
b
z1+z3=z2+z4
c
z1+z2+z3+z4=0
d
z1+z2+z3=z4

detailed solution

Correct option is B

M.P of AC = M.P of BDz1+z32=z2+z42z1+z3=z2+z4

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