SOLUTION: How many four-letter codes can we make using only vowels, a, e, i, o, or u?
N = possible codes
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Question 1022864: How many four-letter codes can we make using only vowels, a, e, i, o, or u?
N = possible codes
Answer by Fombitz(32388) (Show Source): You can put this solution on YOUR website!
Assuming repetition is allowed,
Assuming no repetition is allowed,
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