1. Exercice 19
M A
180 120 40
60
(a) P(M ∩ A)
P(M ∩ A) = P(M) − P(M ∩ A)
300 120 180
= − = = 0, 45
400 400 400

2. Exercice 19 (suite..)
(b) P(M ∪ A)
180 + 120 + 40
P(M ∪ A) =
400
300
= = 0, 85
400
(c) P(M ∩ A)
P(M ∩ A) = P(M ∪ A) = 1 − P(M ∪ A)
60
= 1 − 0, 85 = 0, 15 =
400