Search All of the Math Forum:
Views expressed in these public forums are not endorsed by
NCTM or The Math Forum.



Combinatorics Question Help!!
Posted:
Mar 13, 2008 8:24 AM


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.



