SOLUTION: how many four- letter words are there in which no letter appears 3 or more times in a row?

SOLUTION: how many four- letter words are there in which no letter appears 3 or more times in a row?

Algebra.Com

Question 1046207: how many four- letter words are there in which no letter appears 3 or more times in a row?
Answer by Alan3354(69443) (Show Source): You can put this solution on YOUR website!
How many 4 letter words are there?
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