4*3*2*1 = 24 different combinations.
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How many four digit combinations can be made from the number nine? Example, 1+1+2+5=9.
252 combinations, :)
121
36
To calculate the number of 3-digit combinations that can be made from the numbers 1-9, we can use the formula for permutations. Since repetition is allowed, we use the formula for permutations with repetition, which is n^r, where n is the total number of options (10 in this case) and r is the number of digits in each combination (3 in this case). Therefore, the total number of 3-digit combinations that can be made from the numbers 1-9 is 10^3 = 1000.