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What is the net output voltage for differential amplifier with one op-amp

(a) Vo = -(RF /R1)*Vx

(b) Vo = -(RF /R1)*(Vx -Vy)

(c) Vo = (1+RF /R1)*(Vx -Vy)

(d) None of the mentioned

I had been asked this question during an interview.

This question is from Differential Amplifiers with Multiple Op-Amp topic in portion Operational Amplifier Characteristics of Linear Integrated Circuits

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