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you can image the 3 digits as a counter 0 0 1 0 0 2 ... ... ... 9 9 8 9 9 9 every digit uses 100 times a 6..... 100*3 digits = 300 sixes :)
Assuming you mean whole numbers and leading zeros do not count, the smallest 3 digit number is 100.
100 is a 3 digit number.
100/5 = 20
every alternate number from 100 to 998