P(A)uP(B)=P(A)+P(B)-P(A INTER B°
0.78= 0.62+0.37-P(A inter B)
0.78= 0.99-P(A inter B)
P(A interB )= 0.99-0.78=0.21
P(A)+P(ABARRE)=1
P(B barre)=0.37 P(B)=0.63
même principe
P(AUB)=P(A)+P'B)-P(A inter B)
0.78= 0.62+0.63-P(A inter B)
P(A interB) = 1.25-0.78=0.47