What is the probability that a pkssworc1 contains exactly fo

What is the probability that a pkssworc1 contains exactly four characters and exactly four digits?

There are 26 charecters (assuming here charecters means alphabets), form these 4 can be chosen in 26C4 ways. There are 9 digits from which 4 can be selected in 9C4 ways.

So the total number of outcomes is favorable to the above event is 26C4*9C4.