Ethan forgot the four-digit code to the lock on his briefcase. However, he did remember that the first digit is 9 and the last digit is either 5 or 4. The middle digits could be any number from 0 through 9 inclusive. What is the greatest number of four-digit codes Ethan might have to try in order to to open his briefcase?
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Home » Mathematics » Ethan forgot the four-digit code to the lock on his briefcase. However, he did remember that the first digit is 9 and the last digit is either 5 or 4. The middle digits could be any number from 0 through 9 inclusive.