bonjour
P ( A∪ B ) = p (A) + P (B) - p (A ∩ B)
0.8 = 0.4 + 0.3 - p (A∩ B)
p (A ∩ B ) = 0.8 - 0.7 = 0.1
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bonjour
P ( A∪ B ) = p (A) + P (B) - p (A ∩ B)
0.8 = 0.4 + 0.3 - p (A∩ B)
p (A ∩ B ) = 0.8 - 0.7 = 0.1