SOLUTION: 7.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

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Question 394623: 7.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 consists of
j. 6 different lower-case letters
k. 6 different letters, some may be upper-case, and it is case-sensitive
l. any 6 letters, upper- or lower-case, and it is case-sensitive
m. any 6 characters including letters and digits
Answer by edjones(8007) About Me  (Show Source):
You can put this solution on YOUR website!
j) 1000000/(26*25*24*23*22*21)=1*10^6/165*10^6=1/165
.
k) 10^6/(52!/46!)=625/9161334
.
l) 10^6/52^6=15625/308915776
.
Ed