Only one: 2468.
The order of the digits in a combination does not make a difference.
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There are 9C3 = 84 combinations.
Number of 7 digit combinations out of the 10 one-digit numbers = 120.
It is: 9C7 = 36
There are 840 4-digit combinations without repeating any digit in the combinations.
There are 210 4 digit combinations and 5040 different 4 digit codes.