Hai everyone! I need a little help again on this second part of a problem. Please do not leave links or you will be reported. (Yes, this is another problem on probability I'm stuck on) An explanation to go along as well would be very helpful.

problem:

Answer the following question using arrangements with repetition, permutations, or combinations.

How may different six-digit passwords can be formed from the numbers zero to six if repetition is not allowed? Calculate how many different passwords are possible. (Type a whole number.)​