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Math Forum » Discussions » Math Topics » discretemath

Topic: Combinatorics Question Help!!
Replies: 3   Last Post: Mar 25, 2008 3:29 PM

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Alisha Johnson

Posts: 2
From: London
Registered: 3/13/08
Combinatorics Question Help!!
Posted: Mar 13, 2008 8:24 AM
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Well a student of mine came to me with the following question and I am completely helpless. can somone help??

Question:
I need to get the number of sequences of length 20 consisting of 8 X chars, 7 Y chars and 5 Z chars in which no two Z chars appear adjacently, and X,Y do not appear adjacently.

I tryed sevral ways but there are simply too much options to consider.

Thanks
Alisha.

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