Arbre et tirages successifs

Une urne contient 19 boules : 19 noires , violette et rouges . On effectue deux tirages avec remise.
  • On représente cette situation par un arbre. Le remplir :
  • La probabilité de l'événement tirer une boule rouge au deuxième tirage est

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This is exercise number 1 in a series of 2 exercises.
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