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You are provided with an ideal op amp and three 10kΩ resistors. Using series and parallel resistor combinations, how many different inverting-amplifier circuit topologies are possible?

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You are provided with an ideal op amp and three 10kΩ resistors. Using series and parallel resistor combinations, how many different inverting-amplifier circuit topologies are possible?

(a) 2

(b) 3

(c) 4

(d) 5

The question was asked by my school principal while I was bunking the class.

I'd like to ask this question from The Inverting Configuration in chapter Operational Amplifiers of Electronic Devices & Circuits

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Right option is (c) 4

Best explanation: Consider series and parallel combination of the resistances provided and arrange then in the feedback region and as output resistance.

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