Distinct-Digit Positive NumbersDiscrete Mathematics Level 2
How many 3-digit positive numbers are there that comprise of 3 distinct digits?
Details and assumptions
The number \(12=012\) is a 2-digit number, not a 3-digit number.
2 digits are distinct if they are not the same. The number 121 is not comprised of 3 distinct digits, as the first and third are the same.