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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.

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Q: How many different 3 letter combinations are there... for example airports are typically LHR LGW LAX etc how many different possible combinations are there?

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If order doesn't matter, 15 combinations and if order does matter, 360 combinations are possible.

If the numbers can be repeated and the numbers are 0-9 then there are 1000 different combinations.

The number of combinations - not to be confused with the number of permutations - is 2*21 = 42.

6 Is how many different combinations there are

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There are millions of possible combinations.

56 combinations. :)

If order doesn't matter, 15 combinations and if order does matter, 360 combinations are possible.

If you are allowed to repeat letters (A-Z) then there are 17,576 different combinations. If you can not repeat letters then there are 15,600 combinations.

There are 210 4 digit combinations and 5040 different 4 digit codes.

about 8 million.

Since a number can have infinitely many digits, there are infinitely many possible combinations.

10,000

116,280

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Four of them.

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