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Re:f(AB) + f(A(~B)) = f(A)

Posted by 15914304086 at 2012-07-13 17:12:00 on Problem 2151 and last updated at 2012-07-13 17:36:56
In Reply To:f(AB) + f(A(~B)) = f(A) Posted by:lcjh at 2009-09-01 21:28:02

事件A取为：所有队伍都过了至少一道题目
B：冠军队伍过了N道题目（存在队伍过了N道题目）
f(AB)=f(A)-f(A(~B))

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