Assuming you mean digits and not didgets, the answer is 6.
10 digits are numbers in the billions.
there are 899 whole numbers that have three digits.
two
99999
There are 5 numbers of 1 digit, 25 numbers of 2 digits, and 75 numbers of 3 digits. This makes 105 numbers in all.
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
17 digits
With 123 digits you can make 123 one-digit numbers.
Numbers above 99 and under 1000 are 3-digits, all 900 of them.
763920
there are nine digits in a tax id number