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Oh, what a happy little question! You have 9 choices for the first digit since you can't use 0, then 8 choices for the second digit, 7 choices for the third digit, and 6 choices for the fourth digit. So, you can form 9 x 8 x 7 x 6 = 3024 different 4-digit numbers from the given digits. Just imagine all the beautiful combinations you can create!
If the digits can be repeated, the answer is 94 = 6561.
If no repeats, the answer is 9*8*7*6 = 3024
There are 60480 numbers.
1 set
There are 4^6 = 4096 such numbers.
If the digits are all different then 18. Otherwise, 192.
Assuming you mean permutations of three digits, then the set of numbers that can be made with these digits is: 345 354 435 453 534 543 There are six possible permutations of three numbers.