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

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

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

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