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Express closed loop voltage gain (AF) in terms of open loop gain (A) and feedback circuit gain (B)?

(a) AF = A/AB

(b) AF = 1+ (A/AB)

(c) AF = A/(1+AB)

(d) AF = AB/(1+A)

I had been asked this question by my college professor while I was bunking the class.

This intriguing question comes from Voltage Series Feedback Amplifier topic in section Operational Amplifier Characteristics of Linear Integrated Circuits

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