you say one number first then the other one for example 789 you say seven eight and then nine
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 probably be most appropriate to spell out the number. Example: Three hundred years later...
It would help to know which digit. 0 appears in 9 numbers and each of the others in 18 numbers.
44 for example should be written forty four.
3 digit numbers are lessthan 4 digit numbers
The answer will depend on how many digits there are in each of the 30 numbers. If the 30 numbers are all 6-digit numbers then the answer is NONE! If the 30 numbers are the first 30 counting numbers then there are 126 combinations of five 1-digit numbers, 1764 combinations of three 1-digit numbers and one 2-digit number, and 1710 combinations of one 1-digit number and two 2-digit numbers. That makes a total of 3600 5-digit combinations.
A 3 or 4 digit number.
There is no such ratio that applies for all single-digit and double-digit integers.
There are 28706 such combinations. 5456 of these comprise three 2-digit numbers, 19008 comprise two 2-digit numbers and two 1-digit numbers, 4158 comprise one 2-digit number and four 1-digit numbers and 84 comprise six 1-digit numbers.
With a total of 90,000 five digit numbers, we can conclude that there is 45,000 EVEN five digit numbers.
It would probably be most appropriate to spell out the number. Example: Three hundred years later...
Digit.
There are 9 1-digit numbers and 16-2 digit numbers. So a 5 digit combination is obtained as:Five 1-digit numbers and no 2-digit numbers: 126 combinationsThree 1-digit numbers and one 2-digit number: 1344 combinationsOne 1-digit numbers and two 2-digit numbers: 1080 combinationsThat makes a total of 2550 combinations. This scheme does not differentiate between {13, 24, 5} and {1, 2, 3, 4, 5}. Adjusting for that would complicate the calculation considerably and reduce the number of combinations.
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.