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Mathematics 9 Online
OpenStudy (anonymous):

3. Ethan forgot the four-digit code to the lock on his briefcase. However, he did remember that the first digit is 4 and the last digit is either 9 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? A 162 B 20 C 200 D 22

OpenStudy (anonymous):

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