10
Using the digits of 1345678, there are 210 three digit numbers in which no digit is repeated.
It is 99,887,765
102
The largest number with no repeated digits is 9,876,543,210 although it is 10 digits long, the largest 3 digit number with no repeated digits is 987
757
10
Using the digits of 1345678, there are 210 three digit numbers in which no digit is repeated.
It is 99,887,765
102
The largest number with no repeated digits is 9,876,543,210 although it is 10 digits long, the largest 3 digit number with no repeated digits is 987
It is possible to create a 3-digit number, without repeated digits so the probability is 1.
Repeated twice means we're allowed three of them. That would be 88,866,644. If you really meant repeated, that would be 88,664,420
1
The largest single digit in our numerical system is 9. Once you write 10, you have two digits.
3897
There are only two smaller 3-digit numbers and both of them have repeated digits.