24.
450 whole numbers.
7 two-digit numbers.
90
999-99=900
24.
There are only 999 three digit whole numbers.
450 whole numbers.
There are 900 three-digit whole numbers between 1 and 1000
7 two-digit numbers.
90000
90
999-99=900
a lot
Number of 7 digit combinations out of the 10 one-digit numbers = 120.
-24686
Using 1, 2, and 3, you can make 27 whole numbers.