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Digits or decimal digits more specifically. The decimal system has 10 unique digits 0-9.
9
There is nothing "in" digits. Digits are single characters representing the ten integers from 0 to 9 (inclusive).
Perhapsf you specified the number of digits. e.g. 0-9 with two digits.
The answer is 10P3 = 10!/(10-3)! = 10*9*8 = 720