90. all the numbers from 10 through 99
I believe here are 51 such numbers.
176
-99
-99
100
180
I believe here are 51 such numbers.
176
16
91.
252 of them.
17
525
25 digits
I think its more then 20
19 do.
If you mean 3-digit numbers whose digits are in decreasing order, then the answer is 20.