I’ve explained kavua and kol deporush from statistics. In statistics there’s also such a concept. Kavua means that you’re interested in determining if an instance occurred or not. So the statistical treatment is that this instance either did occur or did not occur. That’s yes or no, in other words kol kevua k’mechtza al mechtza al mechtza, yes or no. In kol d’porush we have an instance that comes out of a population of many, for example teisha chanuyos. Which of the 10 stores did it come from. So we say that it came from the roiv. Why, because in a population of many we statistically decide that it came from one of the total population. The chance in a population of 10 that it came from any is 1 in 10. So in halacho we say that it came from the roiv.
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