It can be calculated as factorial 4
4! = 4x3x2x1= 60
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Oh, dude, you're hitting me with some math vibes here. So, if you have 6 digits to choose from to make a 4-digit combination, you can calculate that by using the formula for permutations: 6P4, which equals 360. So, like, you can make 360 different 4-digit combinations from those 6 digits. Math is wild, man.
There are ten combinations: one each where one of the ten digits, 0-9, is excluded.
There are twelve possible solutions using the rule you stated.
If repetition of digits isn't allowed, then no13-digit sequencescan be formed from only 5 digits.