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There is only one possible combination of a 13 digit number created from 13 digits.

In a combination, the order of the digits does not matter so that 123 is the same as 132 or 312 etc.

If there are 13 different digits (characters) there is

1 combination of 13 digits

13 combinations of 1 or of 12 digits

78 combinations of 2 or of 11 digits and so on

There are 213 - 1 = 8191 in all.

If the characters are not all different it is necessary to have more information.

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12y ago

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