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Questions  

The point z1,z2,z3,z4 in the complex plane are the vertices of a parallelogram taken in order if and only if

a
z1+z4=z2+z3
b
z1+z3=z2+z4
c
z1+z2=z3+z4
d
none of these

detailed solution

Correct option is B

Diagonals of a parallelogram are bisect each other. z1+z32=z2+z42⇒z1+z3=z2+z4

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If z1,z2 and z3  are any three complex numbers then the fourth vertex of the parallelogram. Whose three vertices taken in order are z1,z2,z3  is


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