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Using the digits of 1345678, there are 210 three digit numbers in which no digit is repeated.
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You can select 9 numbers for the first digit, 8 numbers for the second digit, and 7numbers for the third digit; so 504 (e.g. 9*8*7) different three digit numbers can be written using the digits 1 through 9.
If repetition of digits isn't allowed, then no13-digit sequencescan be formed from only 5 digits.
24 different numbers.