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if E A o if £ A Pover . The indicator function of an event AC N, is the 0-1 function IA (x) = Let X Observe that IĄ (X) is a

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X~P ver 2 A Sn f: f CA (x)=! vx El] XE2 AS= RA} P(A) = ! PLA) + = P(A)

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