A certain country's postal service currently uses 6-digit zip codes in most areas. How many zip codes are possible if there are no restrictions on the digits used? How many would be possible if the first number could not be 9? How many zip codes are possible if there are no restrictions on the digits used?
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Step 1: For the first part of the question where there are no restrictions on the digits used, we have 10 choices for each of the 6 digits in the zip code. Show more…
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A certain country's postal service currently uses 6-digit zip codes in most areas. How many zip codes are possible if there are no restrictions on the digits used? How many would be possible if the first number could not be 1? How many zip codes are possible if there are no restrictions on the digits used? 1000000 How many would be possible if the first number could not be 1?
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