Drexel dragonThe Math ForumDonate to the Math Forum



Search All of the Math Forum:

Views expressed in these public forums are not endorsed by Drexel University or The Math Forum.


Math Forum » Discussions » Math Topics » discretemath

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

Advanced Search

Back to Topic List Back to Topic List Jump to Tree View Jump to Tree View   Messages: [ Previous | Next ]
Alisha Johnson

Posts: 2
From: London
Registered: 3/13/08
Combinatorics Question Help!!
Posted: Mar 13, 2008 8:24 AM
  Click to see the message monospaced in plain text Plain Text   Click to reply to this topic Reply

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.



Point your RSS reader here for a feed of the latest messages in this topic.

[Privacy Policy] [Terms of Use]

© Drexel University 1994-2014. All Rights Reserved.
The Math Forum is a research and educational enterprise of the Drexel University School of Education.