# Calculus: Derivatives: General Problems – #3399

Question: The sizes of the cattle herds of two neighboring countries are in the ratio $$u:v$$. One year, a cows got mad disease in country A and in the other country, B, which is to the west of country A, b cows got mad cow disease during the same year. If $$\gamma$$ is an unbelievably small probability, is there any reason to believe that the rate of mad cow disease in one country is larger that of another.