10001
10 digits are numbers in the billions.
there are 899 whole numbers that have three digits.
99999
two
There are 5 numbers of 1 digit, 25 numbers of 2 digits, and 75 numbers of 3 digits. This makes 105 numbers in all.
110000
10 digits are numbers in the billions.
there are 899 whole numbers that have three digits.
525
99999
two
There are 5 numbers of 1 digit, 25 numbers of 2 digits, and 75 numbers of 3 digits. This makes 105 numbers in all.
how many numbers exactly have 4 digits ? 8900, 8999, 9000, 9999
There are infinitely many pairs. Two examples are 55000 and 55000, or 100000 and 10000.
17 digits
Numbers above 99 and under 1000 are 3-digits, all 900 of them.
With 123 digits you can make 123 one-digit numbers.