I. Counting: Basic. Subsets of a set -- Pascal's triangle -- Binomial coefficient identities -- II. Counting: Intermediate Finding a polynomial -- The upward-extended pascal's triangle -- Recurrence relations and fibonacci numbers -- III. Counting: Advanced. Generating functions and making change -- Integer triangles -- Rook paths and queen paths -- IV. Discrete Probability. Probability spaces and distributions -- Markov chains -- Random tournaments -- V. Number Theory. Divisibility of factorials and binomial coefficients -- Covering systems -- Partitions of an integer -- VI. Information Theory What is surprise? -- A coin-tossing game -- Shannon's theorems -- VII. Games. A little graph theory background -- The ramsey game -- Tic-tac-toe and animal games -- VIII. Algorithms. Counters -- Listing permutations and combinations -- Sudoku solving and polycube packing.