Take any one from 1,2,3,... To 9, record and put it back, take n times continuously, and find the probability that the product of the number taken can be divided by 10?
In theory, as long as n is large, the probability is 100%
Because the product of 5 times an even number must be divisible by 10
However, the existence of special circumstances makes the result very pessimistic
For example, take 1000 times in a row, the result of 5 has not appeared, and the probability of conflict