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Questions  

If the complex numbers z1,z2 and z3 represent the vertices of an equilateral triangle such that z1=z2=z3, then 

a
z1+z2+z3=0
b
z1+z2−z3=0
c
z1−z2+z3=0
d
z1+z2+z3≠0

detailed solution

Correct option is A

Let z1=z2=z3=k (says),⇒z1,z2,z3 lie on a circle with centre at the origin and radius k. As z1,z2,z3 are vertices of an equilateral triangle, the circumcentre and the centroid of the triangle coincide. Therefore 13z1+z2+z3=0⇒z1+z2+z3=0

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