a fax number is just the same as a phone number so the same number of numbers
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There are 17 such numbers.
A Thousand digit number will have 999 zeros
Six of them.
The largest 3-digit number=999 the smallest 3-digit number=100 total number of 3 digit number=(999-100)+1 =899+1=900
There is no THE two-digit natural number because there are many of them. 10, 11, 12, .. 99 are all 2-digit natural numbers.