大全-III-14

水色

嗯，guhuo的解释明白了，但觉得D也对啊，请问D错在哪里了呢？

Bow in advance

lexie

取非看看

对E取非无论 如何也得不出结论来 if it's NOT possible to classify a marketing decision properly as being either right or wrong, how could the president draw the conclusion that the decisons were correct only about half of the time.

对D取非 if maketing decisions are NOT likely to be correct as they are to be incorrect, the president could still be able to reach his conclusion, if he has the ability to classify a marketing decision.  

I think the emphasis of this problem is on the president's ability to classify a marketing decision but not the marketing decision itself.

xiaxiagmat

我觉得这是个假设题，必须找到一个使结论成立的必要条件，而非充分条件

    

结论the decisions were correct only about half of
the time成立，E必须成立（主席得有可能把市场决策划分为错的或是对的）

结论the decisions were correct only about half of
the time成立，D不一定成立（市场决策是正确的可能性是50%，与错误的可能性相同）

    

caoqin1981

half of the time 只在半数情况下正确是对了一半的意思啊？！