There are only two smaller 3-digit numbers and both of them have repeated digits.
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It is -987. The smallest positive 3-digit integer with unique digits is 102.
smallest 8 digit number with three different digits
All five digit numbers have three digits. The smallest five digit whole number is 10,000
The smallest odd 7-digit number is 1,000,001 .If you also want the ones digit to be the sum of the thousands and ten-thousands digits,then the smallest odd 7-digit number that satisfies that additional requirement is 1,001,001,but it's no longer the smallest odd 7-digit number.
It is 17.