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There are 10 one digit positive integers (0 - 9) and 9 one digit negative integers (-9 to -1) making 19 in all.
-23
There are 450 even three-digit integers, from 100 to 998. This excludes numbers with leading zeroes (000 to 099).
Of the 729 numbers that satisfy the requirement of positive integers, 104 are divisible by 7.
4