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How many different 3 letter combinations are there... for example airports are typically LHR LGW LAX etc how many different possible combinations are there?
Wiki User
∙ 2010-02-19 16:12:57
There are 26 letters in the alphabet.
If letters may be repeated in the airport code, then there are (26 x 26 x 26) = 17,576 possibilities.
If adjacent letters can't be duplicates, then there are (26 x 25 x 25) = 16,250 possibilities.
If all three letters must be different, then there are (26 x 25 x 24) = 15,600 possibilities.
Wiki User
∙ 2010-02-19 16:12:57
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