When we say that "probability is the limit of frequency", the "limit" mentioned here is not the limit in calculus, but the "limit" in the sense of probability, that is, when the number of experiments n increases indefinitely, the frequency P(n) of random events will be stable near the probability a of the event, or let's put it this way: for any ε0, when n is large, the probability is | p (n)-a |.

This kind of limit, called "convergence in probability" in mathematics, is incorrect and unreasonable to understand with the definition of limit in calculus.

Let's start with the conclusion: the limit of frequency is probability.

But the frequency is different from the frequency. The landlord should be confused. Frequency is the number of events. Frequency is the number of events divided by the total number of tests.

It has long been found that with the increase of the number of experiments, the frequency of events will stabilize near a constant, which is called "probability" to measure the possibility of time occurrence.