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Q: How many number combinations of the number 1 through 8 can there be using 4 digits?

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If the digits can repeat, then there are 256 possible combinations. If they can't repeat, then there are 24 possibilities.

There is only one combination. The order of the digits in combinations makes no difference. They are considered as being different if they are permutations, not combinations.

There are only 10 combinations. In each combination one of the 10 digits is left out.

Yuo can make only one combination of 30 digits using 30 digits.

Since the order of the digits does not matter there are only five combinations: 1234, 1235, 1245, 1345 and 2345.

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128

If the digits can repeat, then there are 256 possible combinations. If they can't repeat, then there are 24 possibilities.

There is only one combination. The order of the digits in combinations makes no difference. They are considered as being different if they are permutations, not combinations.

There are only 10 combinations. In each combination one of the 10 digits is left out.

654321-100000= 554321 combinations

This is a factorial problem. The first number can be any of ten digits, the second any of nine (because you can't repeat a digit), the third any of eight and the fourth any of the remaining 7 digits. 10x9x8x7=5040 combinations.

There are ten combinations: one each where one of the ten digits, 0-9, is excluded.

Yuo can make only one combination of 30 digits using 30 digits.

6 for 3-digits, 6 for 2-digits, 3 for 1-digits, and 15 for all of the combinations

Since the order of the digits does not matter there are only five combinations: 1234, 1235, 1245, 1345 and 2345.

With repeating digits, there are 33 = 27 possible combinations.Without repeating any digits, there are 6 combinations:357375537573735753

The order of the digits in a combination does not matter. So 123 is the same as 132 or 312 etc. There are 10 combinations using just one of the digits (3 times). There are 90 combinations using 2 digits (1 once and 1 twice). There are 120 combinations using three different digit. 220 in all.

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