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Sagot :

KAOHM

P(B) = 0.25

On sait que P(/A) = 0.3 donc P(A) = 1 - P(/A) = 0.7

P(A∩B) = P(A)xP(B)

0.15 = 0.7xP(B)

0.21≈ P(B)

Donc aucune des reponses mais

P(A∪B) = P(A) + P(B) - P(A∩B)

0.8 = 0.7 + P(B) - 0.15

0.1 = P(B) - 0.15

0.25 = P(B)

Donc P(B) = 0.25

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