After the horses win a race, can they win again in their next race? We would expect they have consistent performance but there are many factors affecting the outcome. There are some mysterious saying existing without much data support, e.g. the horse of some trainer cannot perform consistently.
Hong Kong Primary School Students Mathematics Homework is difficult, parents even have to write a computer program in order to solve this. However, while writing traditional programming language is tedious, writing a modeling language like Minizinc is more high-level and easier for general students.