If P(A∩B)=0.1P(A \cap B) = 0.1P(A∩B)=0.1 and P(A∪B)=0.9P(A \cup B) = 0.9P(A∪B)=0.9, find P(Ac)+P(Bc)P(A^c) + P(B^c)P(Ac)+P(Bc).
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