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History 15 Online
OpenStudy (anonymous):

Alfredo has forgotten the five-digit code to the lock on his suitcase. Alfredo remembered that the first digit is 0 and the last digit is either 8 or 4. The middle digits could be any number from 0 through 9 inclusive. What is the greatest number of five-digit codes Alfredo might have to try in order to be sure to open his suitcase?

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