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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.

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.

10,000

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.

7878

Related questions

There are 2^5 = 32 different combinations of the five traits possible.

There are millions of possible combinations.

56 combinations. :)

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

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

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

10,000

116,280

Four of them.

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

18 different combinations. When a coin is tossed twice there are four possible outcomes, (H,H), (H,T), (T,H) and (T,T) considering the order in which they appear (first or second). But if we are talking of combinations of the two individual events, then the order in which they come out is not considered. So for this case the number of combinations is three: (H,H), (H,T) and (T,T). For the case of tossing a die once there are six possible events. The number of different combinations when tossing a coin twice and a die once is: 3x6 = 18 different combinations.

140 possible combinations