bonsoir
on a 7 boules
proba de tirer 2 N = 4/7 x 3/6 = 12/42 = 2/7
proba de tirer 2 R = 3/7 x 2 /6 = 6/42 = 1 /7
proba de tirer une de chaque couleur
= 4/7 x 3/6 + 3 /7 x 4 /6
= 12/42 + 12 /42
= 24/42
= 12/21
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bonsoir
on a 7 boules
proba de tirer 2 N = 4/7 x 3/6 = 12/42 = 2/7
proba de tirer 2 R = 3/7 x 2 /6 = 6/42 = 1 /7
proba de tirer une de chaque couleur
= 4/7 x 3/6 + 3 /7 x 4 /6
= 12/42 + 12 /42
= 24/42
= 12/21