How many different 4 letter combinations can you make?

Answer 1

The number of different 4-letter combinations depends on whether you allow repetitions and whether the order matters. If repetitions are allowed and the order matters, there are 26^4 (or 456,976) combinations using the 26 letters of the English alphabet. If repetitions are not allowed and the order matters, there are 26 × 25 × 24 × 23 = 358,800 combinations. If order doesn't matter, the calculation changes further, but typically the first two scenarios are most common.