Question: A four-digit code is to be created using any digits from 1 - 9. How many four-digit codes can be created if digits can repeat?

A four-digit code is to be created using any digits from 1 - 9.

  1. How many four-digit codes can be created if digits can repeat?
  2. How many four-digit codes can be created if digits can only be used once?
  3. How many four-digit codes can be created that begin with an even digit (assume digits can repeat)?
  4. How many four-digit codes can be created that begin and end with the same digit (assume digits can repeat)?

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