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The nine- digit zip code has become an integral part of the US posta.pdf

The document discusses the significance of the nine-digit zip code within the US postal system. It explains that there are 1,000,000,000 possible combinations, as each of the nine digits can be any number from 0 to 9. The traditional combinations formula is not applicable in this case because numbers can be repeated.

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The nine- digit zip code has become an integral part of the US postal system. a. How many different zip codes are available for use by the postal office? I'm wondering why I can't use the combinations rule N!/n!(N-n)! ? Solution The formula you show is what you use when numbers can't be repeated. In this case, we have a choice of 10 values, 0-9, for each of 9 digits, so the number of possibilities equals 10^9, or 1,000,000,000.

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The nine- digit zip code has become an integral part of the US posta.pdf

  • 1.
    The nine- digitzip code has become an integral part of the US postal system. a. How many different zip codes are available for use by the postal office? I'm wondering why I can't use the combinations rule N!/n!(N-n)! ? Solution The formula you show is what you use when numbers can't be repeated. In this case, we have a choice of 10 values, 0-9, for each of 9 digits, so the number of possibilities equals 10^9, or 1,000,000,000.