KEAM 2012 Math Paper

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Question : 28 of 120

Marks: +1, -0

Let z≠1 be a complex number and let ω=x+iy,y≠0. If

ω−

−

ω

z

1−z

is purely real, then |z| is equal to

|ω|
|ω|2
1
|ω|2
1
|ω|
1

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