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OpenStudy (anonymous):
Passwords for a certain computer system are strings of uppercase letters. A valid password must contain an even number of X's. Determine a recurrence relation for the number of valid passwords of length n.
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OpenStudy (anonymous):
add any non-X to the end of a good password of length n-1
OpenStudy (anonymous):
add an X to the end of a bad password of length n-1
OpenStudy (anonymous):
Any help would be appreciated...I mean any.
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