请问a是b的充分条件则b是a的必要条件，对吗？

vikiviki · 发表于 2016-7-26 23:09:36

请问a是b的充分条件则b是a的必要条件，对吗？

谢谢！！

Coco.He · 发表于 2016-7-27 17:04:38

不是如果b是a的必要条件的话那就成为充要条件了

vikiviki · 发表于 2016-7-27 20:15:45

嗯？应该是如果a是b的充分条件且a是b的必要条件的时候，才说a是b的充要条件吧。。。

小ron · 发表于 2016-7-27 20:18:42

想说这个和gmat有关系吗？有没有实际的题目看一下

vikiviki · 发表于 2016-7-27 20:29:57

嗯，总是做错一些考察类似概念的题，具体的就那下面这个当例子吧。谢谢大家。。。

If there are any inspired musical performances in the concert, the audience will be treated to a good show. But there will not be a good show unless there are sophisticated listeners in the audience, and to be a sophisticated listener one must understand one’s musical roots. If all of the statements above are true, which one of the following must also be true?
A. If there are no sophisticated listeners in the audience, then there will be no inspired musical performances in the concert.
B. No people who understand their musical roots will be in the audience if the audience will not be treated to a good show.
C. If there will be people in the audience who understand their musical roots, then at least one musical performance in the concert will be inspired.
D. The audience will be treated to a good show unless there are people in the audience who do not understand their musical roots.
E. If there are sophisticated listeners in the audience, then there will be inspired musical performances in the concert.

请问a是b的充分条件则b是a的必要条件，对吗？

所属分类: GMAT考试

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