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If there is a 70% chance a certain occurrence might happen, does it have any chance of happening?
There must be a 100% chance that something might occur for it to have any chance of occurring.
If there's less than a 100% chance, then might is no longer might, but only a chance of might, which is itself only a possibility. If it's not 100% possible, then the occurrence is not possible, because possibility has to be for sure for something to be possible
The probability of something happening when added to the probability of it not happening always comes out to be one.
Probabilities tell you what the odds are for a certain outcome in a trial which means they only make sense in the context of many, many trials. Probabilities cannot be used to predict the exact outcome of any trial; a 40% probability of a specific outcome only means that out of ten trials, 4 of them will come out that way- on average.
