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.
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Number of 7 digit combinations out of the 10 one-digit numbers = 120.
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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.
You can make 5 combinations of 1 number, 10 combinations of 2 numbers, 10 combinations of 3 numbers, 5 combinations of 4 numbers, and 1 combinations of 5 number. 31 in all.
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