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$$
P(A)=\frac{1}{2}, P(B)=\frac{1}{3}, P(C)=\frac{1}{5} P(A B)=\frac{1}{10}, P(A C)=\frac{1}{15}, P(B C)=\frac{1}{20}, P(A B C)=\frac{1}{30}
$$
                        
不再提醒