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

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

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Analog Electronics
When a transistor is connected in common emitter mode, it with have

Negligible input resistance and high output resistance
Medium input resistance and high output resistance
Low input resistance as well as output resistance
High input resistance and low output resistance

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