How many possible three-digit passwords can be formed using digits 0 through 9 if digits are repeated?

30,

720,

1,000 ... ?

I think the correct answer from the choices listed above is the second option. There would be about 720 possible three-digit passwords that can be formed using digits 0 through 9 if digits are repeated. THis can be calculated by getting 10P3 in a calculator. Hope this answers the question.