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Topic: Euh...
Posted by: P.S, le ragondin des Alpages. at mar. 29 mars 2011 11:47:01
Keywords:
Message:

... non.

2 succès : 3/8 de proba effectivement. Si ça te paraît contre instinctif, tu peux rapidement faire un arbre, et tu constateras que sur 8 résultats possible, seul trois amène à réaliser strictement 2 succès.

Si maintenant tu cherche à connaître la proba de réaliser deux succès ou plus, alors il faut additionner les différentes proba (proba de 2 succès et proba de 3 succès).

Donc, effectivement, 2 succès ou plus donne un proba de 4/8, soit 1/2, mais strictement 2 succès donne un proba de 3/8.

P.S.



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