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The probabilities of three events A ,B ,...

The probabilities of three events `A ,B ,a n d \ C` are `P(A)=0. 6 ,P(B)=0. 4 ,a n d \ P(C)=0. 5.` If `P(AuuB)=0. 8 ,P(AnnC)=0. 3 ,P(AnnBnnC)=0. 2` ,and `P(AuuBuuC)geq0. 85 ,` then find the range of `P(BnnC)`.

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