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How many unique codes are possibly formed from two characters, where the first character can be...

How many unique codes are possibly formed from two characters, where the first character can be 3 to 7, and the second character can be C to F?

Last question I posted was answered incorrectly, so I am reasking with the new question that I have to answer before I can move forward. :-(

Math   Statistics-And-Probability   
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