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D 2.29 An inverting op-amp circuit using an ideal op amp must be designed to have a gain of −500 V/V using resistors no larger than 100 k. (a) For the simple two-resistor circuit, what input resistance would result? (b) If the circuit in Fig. 2.8 is used with three resistors of maximum value, what input resistance results? What is the value of the smallest resistor needed?