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Question

If z1,z2,z3 be three complex numbers which are in H.P. And the points A(z1),B(z2),C(z3) are non-collinear, and O is origin, then:


A

O is centroid of ABC

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B

O, A, B, C are concyclic

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C

O, A, B, C are collinear

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D

None of these

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Solution

The correct option is B

O, A, B, C are concyclic


z2 = 2z1z3z1+z3

z20z10 = z2z1eiα

z3z1z3eiβ = 12z2z1eiβ

arg z2z1 = argz2z3z1z3

AOB = ACB

Hence, O,A,B,C are concyclic.


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