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Question

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

A
0
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B
1
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C
-1
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D
None of these
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Solution

The correct option is A 0

Let the complex number z1,z2,z3 denote the vertices A,B,C of an equilateral triangle ABC.
Then,if o be the origin,we have O¯A=z1,O¯B=z2,O¯C=z3
Therefore z1= z2 z3 OA=OB+OC i.e, O is the circumcentre of ABC.Hence
z1+z2+z3=0.


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