求助OG12 CR95

sdcar2010

NN, could you plz help clarify whether negation must be needed here?

You ever mentioned that the word IF is used in Sufficient assumption prompts rather than in Necessary assumption ones. So here is a sufficient assumption question. For Sufficient assumption quetions, is Negation necessary in general?

Thks a lot for your COOL explanations!

-- by 会员 AlohaDJ (2011/8/4 22:49:20)

Good catch. I missed that part. For sufficient assumption, negation method is not required because not all necessary assumptions are sufficient assumption at the same time.

AlohaDJ

Noted with many thanks!!

ethancjj

请问就是C选项缩小了范围的意思吗？
当时也是觉得这样所以把C排除了，可是OG后面的答案解释却说的是 因为这是irrelevant 所以才错，所以OG的意思是如果写成
Any enterprise that does not use scientific methods is not genuine science.
那么，根据OG的解释，这样也是错的。

请问我的理解正确吗 ？？ 求各位大神解释。

naoyixue

个人认为还是尊重og的思路

InfiniteAlex

Any enterprise that does not use controlled experiments and statistical tests is not genuine science.
不等于
All enterprise that use controlled experiments and statistical tests is genuine science.

比如：
任何不能被5整除的数一定不以5结尾。
不等于
所有能被5整除的数都以5结尾。（这句话显然错了，因为还有以0结尾的数能被5整除）