well, 123 213 312 321 132 231 that's all
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Assuming you are using the standard English alphabet, the number of combinations you can make are: 26 x 26 = 676 combinations.
4*3*2*1 = 24 different combinations.
How many four digit combinations can be made from the number nine? Example, 1+1+2+5=9.
90
10 * * * * * That is just plain wrong! It depends on how many numbers in each combination but there are 1 combination of 4 numbers out of 4, 4 combinations of 3 numbers out of 4, 6 combinations of 2 numbers out of 4, 4 combinations of 1 number out of 4. A grand total of 15 (= 24-1) combinations.