Via twitter : Roger Federer and Novak Djokovic often seem to face each other in the semifinals. Too often. This article by Rob Minto tries to explain that the chance of them meeting in any one competition should be 50/50. However, they’ve met 16 times out of 21 instead. Rob asks : is this too many?
Imagine you have two coins. One side is blank, and one has a single dot. You flip the coins. How many ways can you get 0 dots? How many ways can you get 1 dot? How many ways can you get 2 dots?
If you got answers like “1 way / 2 ways / 1 way” you got it right.