For a negative feedback system, A=3 and β=2 and output impedance without feedback are 100Ω. What will be its total output impedance?

For a negative feedback system, A=3 and β=2 and output impedance without feedback are 100Ω. What will be its total output impedance? Correct Answer 14.3 Ω

Output impedance with feedback in a negative feedback system is Rf=Ro/(1+Aβ).
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