Ahacker is trying to guess someone's password. the hacker knows (somehow) that the password is 12 characters long, and that each character is either a lowercase letter, (a, b, c, etc), an uppercase letter (a, b, c, etc) or a numerical digit (0, 1, 2, 3, 4, 5, 6, 7, 8, or 9). assume that the hacker makes random guesses.