Events AAA and BBB are such that P(A)=0.5P(A) = 0.5P(A)=0.5, P(B)=0.4P(B) = 0.4P(B)=0.4, and P(A∪B)=0.8P(A \cup B) = 0.8P(A∪B)=0.8. What is P(Ac∩Bc)P(A^c \cap B^c)P(Ac∩Bc)?
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0.4