Analog Electronics
The most commonly used amplifier in sample & hold circuits is

An inverting amplifier with a gain of 10
A unity gain inverting amplifier
A unity gain non-inverting amplifier
An inverting amplifiers with a gain of 100

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

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

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