89
99 hundreds, 10 tens,4 ones
8 of them.
88
99 palindromes.
99 palindromes.
what is the difference between 10 meq er of potassium and 99 mg of potassium
There are 17,999 such numbers.
8 ... they are 20, 30, 40, etc on up to 90
(9 × 10) + 9 = 99 is the number.
If you count 11 as 2 instances, the digit 1 appears 18 times if you don't count 10, 19 times if you do. 10,11,12,13,14,15,16,17,18,19,21,31,41,51,61,71,81,91
109
That's an infinite list. If you restrict it to integers, then count by ones from 12 to 98.