Oh, dude, there are like 26 letters in the alphabet, right? So, for each position in a 3-letter combination, you have 26 choices. That means you'd have 26 choices for the first letter, 26 for the second, and 26 for the third. So, the total number of 3-letter combinations would be 26 x 26 x 26, which is... math.
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17,576 possible combinations
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Not quite! This is the total number of permutations of 3 letters out of 26. AAB is counted as being different from ABA or BAA. But these are the same combinations.
Thus there are 26 combinations of just one letter.
26*25 combinations of two letters and
26*25*24/(3*2*1) of three.
In all, that makes 26 + 650 + 2600 = 3276
4*3*2*1 = 24 different combinations.
Just 4: 123, 124, 134 and 234. The order of the numbers does not matter with combinations. If it does, then they are permutations, not combinations.
As there are 26 letters in the alphabet. You can calculate the number of combinations by multiplying 26x26x26, giving you the answer 17576.
Six combinations: 123, 132, 213, 231, 312, 321
90