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

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

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

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

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