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  1. J

    Basic Question

    Hi all, I feel a little embarrassed about this, but: what is the rule linking the probability of an event A to the weighted sum of its sub-events? E.g. if A is a set of three events, {a1, a2, a3}, then P(A) = E(a*), right? Is it derivable from the axioms? Does this rule have a name? Thank...