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From Bernoulli’s Fallacy:
Where the frequentist interpretation struggles most, though, is in handling probabilities of one-time events. For example, if we want to say a certain politician has a 29 percent probability of winning the next election, how can this statement even be given a meaning in terms of frequencies? The election will happen only once, and even if we could imagine repeating it, à la Venn's imaginary coin flips, what conditions would have to change each time in order to produce different outcomes at all? If the election were held again, wouldn't all the voters vote the same way?