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How many five-digit zip codes exist such that each of the first three digits is greater than 4?

 Apr 21, 2020
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If you allow repeats of first 3 digits such as 55512, then you have =12,500 such numbers.

 

If repeats are not allowed for the first 3 digits such as 56712, you have =6,000 such numbers.

 Apr 21, 2020

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