As we all know, food is very important and indispensable for human beings. Without food, we humans can't survive. Human catering culture varies from region to region, and the cooking methods in each region are unique. Different weather, geography, culture, traditions and lifestyles will have an impact on human catering culture. With the change of time, many forms of food have appeared. When n=4, x is used to represent the number of pits to be seeded and find the distribution columns and mathematical expectation of x
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