Analog Electronics
Voltage Series (feedback also called series-shunt feedback) results in

Increase in input impedance & decreases in output impedance
Increase in both input & output impedances
Decrease in input impedance & increase in output impedance
Decreases in both input & output impedances

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Analog Electronics
When a transistor is connected in common emitter mode, it with have

High input resistance and low output resistance
Low input resistance as well as output resistance
Negligible input resistance and high output resistance
Medium input resistance and high output resistance

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