Question

list the first twenty counting numbers in base 9 ???????????????????????

Answer 1

1,2,3,4,5,6,7,8,10,11,12,13,14,15,16,17,20,21,22,23

Answer 2

In base 9, you count the same way as in base 10, except you skip everything with a 9. So you would have the numbers 0-8 like normal, and them move on to 10. Then you write 11-18, and move on to 20. Continue until you hit twenty numbers.