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A four-character secret code can begin with any two of the five vowels and end with any two numerals, from 0 to 9. How many different four-character secret codes are possible?
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A four-character secret code can begin with any two of the five vowels and end with any two numerals, from 0 to 9. How many different four-character secret codes are possible?

User Alexander Sigachov
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2500 is this answer to your problem
User John Towers
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