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Step of 6 1.050P Consider the amplifier should have input resistance much higher than the source resistance to minimize the loading on 0.5 MΩ source. Hence, amplifier stage A is to be used as first stage because 1 > 0.5 Now, the middle stage should have high gain. Hence, amplifier stage B is to be used as second stage, because = The last stage should have low output resistance. Hence, amplifier stage C is to be used as output stage, because 20 Ω