There can be only 1 combination since, in a combination, the order of the digits does not matter. So, since you must have each digit once and only once, the only combination is 3456.
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If each number can be used only once then there are just four: 2345, 2346, 2456 and 3456. There are no others because the order of the digits does not matter in combinations.
There are only 10 combinations. In each combination one of the 10 digits is left out.
A very unique number; it is divisible by each single digit number except 5 and 7.
It depends. If you can only use each number once, there are 720 combinations. If you can use numbers multiple times, then there are 1000 combinations, by using all numbers from 000 to 999.
The answer is five factoral (5!) which is 120.