Some parts of my spare time are filled with creating and collecting
probability theory questions and puzzles. I maintain a list of
probability questions which you can find below. Although short, some
of these are non-trivial. I hope that trained probabilists still
find some of them challenging.
I'm also using them in my teaching of 1st year undergraduate
students. I'm always interested in alternative solutions, extensions
or new questions so if you happen to solve them or have suggestions
for new puzzles then please do contact me.