A spyware is trying to break into a system by guessing its password. It does not give up until it tries 1 million different passwords. What is the probability that it will guess the password and break in if by rules, the password must consist of (a) 6 different lower-case letters (b) 6 different letters, some may be upper-case, and it is case-sensitive (c) any 6 letters, upper- or lower-case, and it is case-sensitive (d) any 6 characters including letters and digits

A spyware is trying to break into a system by guessing its password. It does not give up
until it tries 1 million different passwords. What is the probability that it will guess the
password and break in if by rules, the password must consist of
(a) 6 different lower-case letters
(b) 6 different letters, some may be upper-case, and it is case-sensitive
(c) any 6 letters, upper- or lower-case, and it is case-sensitive
(d) any 6 characters including letters and digits