SOLUTION: How many three-letter codes can we make using only vowels, a, e, i, o, or u?

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Question 1139203: How many three-letter codes can we make using only vowels, a, e, i, o, or u?
Answer by ikleyn(52754) About Me  (Show Source):
You can put this solution on YOUR website!
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Take the number of vowels and raise it into the degree 3.