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Une loi de probabilité P est définie sur un univers (l'univers est l'ensemble des issues d'une expérience aléatoire). Soient A et B deux évènements tels que P(A)=/0, la probabilité conditionnelle de "B sachant A" est la probabilté que B se réalise sacahnt que A est réalisé. Elle se note Pa(B) et on a Pa(B)= P(A union B)/P(A)
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