Do you mean "How many ways can you arrange the digits '6', '9', '1', and '3' " ??
If so, then the answer is 24 ways.
There is only one combination, since the order of the digits in a combination does not matter. If the order does matter, then they are called permutations and there are 24 of them.
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You could make 10*10*10*26*26*26 combinations, or 17576000 combinations.
8x7x6x5x4x3x2x1
The answer is 6,900
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.
22