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If |(z+i)/(z-i)| = ?3, then radius of the circle is (a) 2/?21 (b) 1/?21 (c) ?3 (d) ?21

If |(z+i)/(z-i)| = ?3, then radius of the circle is

(a) 2/?21

(b) 1/?21

(d) ?21

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