Analog Electronics
Darlington connection is achieved in 2 transistors by connecting

 both emitter.
 both collector.
 grounding both collector.
 both base.

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Analog Electronics
The typical input stage of an opamp has a

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

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