you say one number first then the other one for example 789 you say seven eight and then nine
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3 digit numbers are lessthan 4 digit numbers
A 3 or 4 digit number.
There is no such ratio that applies for all single-digit and double-digit integers.
It would help to know which digit. 0 appears in 9 numbers and each of the others in 18 numbers.
Using the digits of 1345678, there are 210 three digit numbers in which no digit is repeated.