I think one way is that the topic gives a distribution that conforms to … For Poisson distribution, normal distribution is generally said. If no topic is specified, the hypergeometric distribution is to find the probability of m samples, where X is class A and Y is class B; The binomial distribution is that the probability of an event is p, and now this event has been carried out n times, so find the probability of x times; Classics are often similar to dice ... In fact, you have to figure out their definition and how to ask for them, and you will know the difference.