Hi, my name is Robert and I was just curious about how to figure out how many tries it would take to unlock my new combination lock. The lock has a button in the middle that you press up, down, right or left. You have four directions to choose from. I set the lock to unlock with the input of seven directions. These directions have to be entered in the right order. I was wondering how many tries it would take to unlock the padlock. What kind of formula would be used? Basically, I just find this sort of stuff interesting and I have been out of school for years. Any help to satisfy my curiosity would be appreciated.