Urne 1

(R), (N), (N), (B), (N), (N), (N), (J), (R), (R)

Dans une urne, nous avons 5 boules noires (N), 1 boule jaune (J), 1 boule bleue (B), et 3 boules rouges (R), indiscernables au toucher.

Quelle est la probabilité de tirer une boule noire (N)?

La probabilité (sous forme de fraction) =

Enter your reply:


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