Probabilités : 1. Exercice 15 : 5 points

⇒P(1) = 1/6
P(n≤3) = 3/6 = 1/2
⇒P(face) = P(pile) = 1/2
A A
P(A) + P(A) = 1
P(A) = 1 −P(A)
P(A∪B) = P(A) + P(B)−P(A∩B)
(A∩B),(A∩B),(A∩B),(A∩B)
B B
A A ∩B A ∩B
A A ∩B A ∩B
P(A) = P(A∩B) + P(A∩B)
P(B) = P(B∩A) + P(B∩A)
P(A) + P(B) = 2P(A∩B) + P(A∩B) + P(B∩A)
P(A∪B) = P(A∩B) + P(A∩B) + P(A∩B)
P(A∪B) = P(A) + P(B)−P(A∩B)
≥
≤
≥
≤

PR(B) = P(B%R) = 0.11
PR(C)
P(B∪C)