Analog Electronics
The arrowhead on the transistor symbol points in the direction of

  conventional electric current flow in the emitter region.
  majority carrier flow in the emitter region.
  minority carrier flow in the emitter region.
  electron flow in the emitter region.

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Analog Electronics
The typical input stage of an opamp has a

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

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