They are: 99 and 90
180
There are 900 digits between the numbers 100 and 999. This range includes all the three-digit numbers from 100 to 999, which is calculated by subtracting 100 from 999 and adding 1 (to include both endpoints): 999 - 100 + 1 = 900.
16
91.
100C3= 100x99x98/3!= 161700 The notation is 100 choose 3
525
I believe here are 51 such numbers.
180
900, all numbers from 100 to 999 inclusive.
There are 900 digits between the numbers 100 and 999. This range includes all the three-digit numbers from 100 to 999, which is calculated by subtracting 100 from 999 and adding 1 (to include both endpoints): 999 - 100 + 1 = 900.
90. all the numbers from 10 through 99
176
16
10
91.
252 of them.
-99