Who is possible Using the digit only once form all possible 3 digit number?

To form all possible three-digit numbers using the digits 0-9 without repetition, you can select any digit from 1-9 for the hundreds place (9 options), any digit from 0-9 for the tens place (10 options), and any remaining digit for the units place (8 options). However, since the first digit cannot be 0, the total number of valid combinations is calculated as 9 (choices for the first digit) × 9 (choices for the second digit, including 0) × 8 (choices for the third digit). This results in 9 × 9 × 8 = 648 unique three-digit numbers.