Calculate Combination Lock Numbers Odds Of Randomly Guessing A 4-digit Combination Lock?

Odds of randomly guessing a 4-digit combination lock? - calculate combination lock numbers

I have a 4-digit combination lock with a pocket. More in the parapsychology section that asked people to try to me (the combination of the long forgotten). With a combination of two answers, open the castle! I have the first two digits of a reply and the last two in another.

Although this is not possible, the probability of charge in this case, the probability of guessing randomly lock to 4 digits (numbers 0-9, of course).