Question: A U.S. postal zip code is a five-digit number. a) How many zip codes are possible if any of the digits 0 to 9 can

A U.S. postal zip code is a five-digit number.
a) How many zip codes are possible if any of the digits 0 to 9 can be used?
b) If each post office has its own zip code, how many possible post offices can there be?

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