No. Once you take an event as given, its probability is now 1. In conventional notation, P(A|A) = 1 ("the probability of A given A is 1"). For the sake of argument, it has now occurred, and the probability of an event that has already occurred is 1, just as the probability of an event that didn't occur in the past is now 0.
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No. Once you take an event as given, its probability is now 1. In conventional notation, P(A|A) = 1 ("the probability of A given A is 1"). For the sake of argument, it has now occurred, and the probability of an event that has already occurred is 1, just as the probability of an event that didn't occur in the past is now 0.