1. f.thuijsman@maastrichtuniversity.nl Department of Knowledge Engineering 1 Tickling the Brain Frank Thuijsman

2. f.thuijsman@maastrichtuniversity.nl Department of Knowledge Engineering 2 Counting

3. f.thuijsman@maastrichtuniversity.nl Department of Knowledge Engineering 3 Counting

4. f.thuijsman@maastrichtuniversity.nl Department of Knowledge Engineering 4 Counting

5. f.thuijsman@maastrichtuniversity.nl Department of Knowledge Engineering 5 Counting

6. f.thuijsman@maastrichtuniversity.nl Department of Knowledge Engineering 6 How? Counting

7. f.thuijsman@maastrichtuniversity.nl Department of Knowledge Engineering 7 A modified example

8. f.thuijsman@maastrichtuniversity.nl Department of Knowledge Engineering 8 A modified example

9. f.thuijsman@maastrichtuniversity.nl Department of Knowledge Engineering 9 A modified example

10. f.thuijsman@maastrichtuniversity.nl Department of Knowledge Engineering 10 A modified example

11. f.thuijsman@maastrichtuniversity.nl Department of Knowledge Engineering 11 5 5 5 5 5 8 8 8 8 8 8 13 8 Area 13 x 13 = 169 Area 8 x 21 = 168 Another Puzzling Puzzle

12. f.thuijsman@maastrichtuniversity.nl Department of Knowledge Engineering 12 A modified example

13. f.thuijsman@maastrichtuniversity.nl Department of Knowledge Engineering 13 An Intelligence test

14. f.thuijsman@maastrichtuniversity.nl Department of Knowledge Engineering 14 Operations Research The Science of Better

15. f.thuijsman@maastrichtuniversity.nl Department of Knowledge Engineering 15 And now some Totally Flipped Mathematics H-T-H-H-H-T-H-T-T-T-H-T-H-T-H-T-T-T-T-H-H-T What is the expected number of coin flips until we see T-H-H-T for the first time?