Analog Electronics
The input signal for an instrumentation amplifier usually comes from

 a differential amplifier.
 a Wheatstone bridge.
 a resistor.
 an inverting amplifier.

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Analog Electronics
The typical input stage of an opamp has a

  single - ended input and single-ended output.
  differential input and differential output.
  differential input and single - ended output.
  single - ended input and differential output.

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