The first digit of the password can be any of the ten digits - 10 possibilities. A digit cannot be repeated, so the second digit can be any digit except the one you chose for the first digit - 9 possibilities. The third digit can be any digit except the digits you chose for the first and second digit - 8 possibilities.
Using the rule of product: [tex]10 \times 9 \times 8=720[/tex]
