The so-called random function means that with the passage of time, its result is uncertain ["random" means "uncertain"], which may be one result or another, but on the whole, its result will not exceed the possible range [all possible results are its possible range]. The premise of ensuring randomness is that the possibility is not unique, that is, there are at least two or more possibilities.

For example, when you buy a lottery ticket, you only talk about winning or not winning. Generally, there are only two possibilities: winning or not winning. But when it comes to you, it's hard to say You may win or lose. Completely uncertain [random]. If you want to say the first prize, the first prize, the first prize, the second prize, the third prize and the no prize, there are six possibilities, but you can't be sure. Unless all the prizes are won, only the lottery ticket that can't be won is left, it will no longer be a random event, because there is only one result-"no win". Considering this situation, a fool may not do it. Who will burn their hands with money? Hehehe!

In layman's terms, this is probably the case.