Skip to content / Đến nội dung
ThichHocToan.com

Australian AMC 2019 - Junior Question 30

AMC AUSTRALIA · Australian AMC 2019 - Junior

Question 30

The Leader of Zip decrees that the digit 0, since it represents nothing, will no longer be used in any counting number. Only counting numbers without 0 digits are allowed.
So the counting numbers in Zip begin 1, 2, 3, 4, 5, 6, 7, 8, 9, 11, 12, . . . , where the tenth counting number is 11.
When you write out the first one thousand allowable counting numbers in Zip, what are the last three digits of the final number?