Wikipedia 10K Redux by Reagle from Starling archive. Bugs abound!!!

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:[[Probability]] :[[Probability Axioms]] -- [[Probability Distributions]] The basic theorems of probability can be developed easily from the [[Probability Axioms]] and [[Set Theory]]. #The sum of the probabilities for all the ''elementary events'' is one. #For any arbitrary events, A_{1}and A_{2}, the probability of both events, Pr[A_{1}*A_{2}], is given by the sum of the probabilities of the ''elementary events'' in both A_{1}and A_{2}. If the intersection is empty, then the probability is exactly zero. #For any arbitrary events, A_{1}and A_{2}, the probability of either or both, Pr[A_{1}+A_{2}], is given by *1]+Pr[A_{2}]-Pr[A_{1}*A_{2}] The probability of some event happening knowning that some other one happened before can be computed using [[Conditional Probability]]. ---- [[Dick Beldin]]