The probability of combinations of events
4.4
p(E) = 1- p(E)
Proof: Note that |E| = |S| - |E|. So,
|S| - |E| |E|
p(E) = --------- = 1 - ----- = 1-p(E). End of proof.
|S| |S|
P(E1?E2)=p(E1)+p(E2)-p(E1?E2)
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