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Zip codes with 5 digits (all five digits can be repeated): 9 * 10 ^4 = 90000 Zip codes with no digit being repeated: 9*9*8*7*6 = 27216

Zip codes with at least one digit being repeated: 90000-272162784 ?

I don't think this should be the case:

5 digit ZIP code is different from 5 digit number, I suppose. 5 digit number can not start with 0, as it becomes 4 digit in this case but 5 digit ZIP code can be 01234. Meaning that if we take zip code of a credit card, it can start with 0 eg 01234 and still be 5 digit.

Re: How many 5 digit ( digit = 0 - 9 ) zip codes can exist in wh [#permalink]

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23 Aug 2016, 22:35

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