Analog Electronics
The following relationship between α and β are correct except

  β = α / (1 - α).
  α = β / (1 - β).
  1 - α = 1 / (1 + β).
  α = β / (1 + β).

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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 single - ended output.
  differential input and differential output.

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