Sep 12: Pigeonhole and addition principles. Counting sets of pairs. 
Sep 14: Counting sets of pairs (cont). Euler's function. 
 Tutorial: No tutorial.
 
Sep 19: Euler's function (cont). Functions, words and 
selections. 
Sep 21: Ordered selections without repetitions. Permutations.
 Tutorial: Review of Chapters 6 and 10. 
 
Sep 26: Permutations (cont). Binomial numbers. 
Unordered selections without repetitions. 
Sep 28: Unordered selections with repetitions. 
Binomial theorem. 
 Tutorial: Review of Chapters 10 and 11.
 
To October lectures.