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JQuinton comments on Rationality Quotes May 2014 - Less Wrong
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Yes, either X happens or X doesn't happen. P(X) + P(~X) = 1, so therefore P(X | A) + P(~X | A) = 1. Both formulations are stating the probability of X. But one is adjusting for the probability of X given A; so either X given A happens or X given A doesn't happen (which is P(~X | A) not P(X | ~A)).