By using counting techniques to compute the following probability, and with the following variables;

26 letters (lowercase)

31 Special characters

How many 8 character passwords are possible?

What is the probability of the password only containing letters?

What is the probability of guessing the 8 character password on the first try?

How many 15 character passwords are possible (no restrictions on characters)?

What is the probability of guessing the 15 character password on the first try?