12.若 PA = 0.8, PB=0.7 且 P(A U B) =0.90,則 P(A fl B) =
(A) 0.5
(B) 0.6
(C)0.7
(D) 0.8

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統計： A(0), B(3), C(0), D(0), E(0) #1347308