There are 900 hundred positive three digit numbers.
My previous answer was wrong! Argh.
The smallest three-digit number is 100. ( 999 + 1 ) - 100 = 900
And the original answerer was correct.
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900 numbers from 100 to 999
899 - 99 = 800 of them
None. 3 digit numbers are not divisible by 19 digit numbers.
It is -987. The smallest positive 3-digit integer with unique digits is 102.
90 of them.