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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):
n0=1,n1=1,n2=2,n3=4,n4=7, do those base cases look correct?
OpenStudy (anonymous):
actually, n4=8, does the recurrence relation have anything to do with it being powers of 2?
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