Guessing a password

What is the probability of correctly guessing  a student's TBC Goggle password?

Criteria of the password: lower case and upper case alphabet (52), special characters (8), numbers (10). Length = 8 characters.

1) Probability of guessing password if it is 1 character long

2) Probability of guessing password if it is 2 characters long

3) Probability of guessing password if it is 3 characters long

4) Probability of guessing password if it is 8 characters long