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Q: How many 3-letter code words are possible using the first 7 letters of the alphabet if adjacent letters cannot be the same?
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How many rearrangements of ABCs are there in which non two adjacent letters are also adjacent letters in the alphabet?

There are none.In the alphabet, B is adjacent to both A and C. Wherever B is in the rearrangement, it must be adjacent to either A or C and so is adjacent to a letter in the alphabet.


How many 3-letter code words are possible using the first 8 letters of the alphabet if adjacent letters can not be the same?

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How many 9 letter combinations using 26 alphabet letters?

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