## Question

###### Consider passwords which are are strings over alphabet LUD as in Problem and compute the nuber of passwords that satisly the following constraints: Password length is 9 and has nlO repealed characters.Password length is 9, iL hasrepealed characters; and it has al least one letter:Password length is 9, it has no repeated characters, and it has at least one letter and at least one digit_

Consider passwords which are are strings over alphabet LUD as in Problem and compute the nuber of passwords that satisly the following constraints: Password length is 9 and has nlO repealed characters. Password length is 9, iL has repealed characters; and it has al least one letter: Password length is 9, it has no repeated characters, and it has at least one letter and at least one digit_

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