!考大家!喜歡可以想想吧 本人已知solution
(In classical logic)
A Prove for the number of The people who are boys and graduated in any place
+The number of the people who are girls and studying Maths in any place
is larger than or equal to the number of the people who are graduated and studying
Maths in any place.
想想如何prove 吧
難度4-5問題maths
2015-01-10 12:31 am
回答 (2)
2015-01-10 8:14 am
✔ 最佳答案
Let the no. of boys who graduated but not studying maths be A, the no. of boys who graduated and studying maths be B,
the no. of girls who graduated and studying maths be C,
and the no. of girls studying maths but not graduated be D.
The no. of boys who graduated=A+B
The no. of girls who studying maths=C+D
The no. of people who graduated and studying maths=B+C
(A+B)+(C+D)>=B+C
So the no. of boys graduated + the no. of girls studying maths >= the no. of people graduated and studying maths
I guess should be something like this.
2015-01-10 6:35 am
#(boys graduated) + #(girls study Math)
= #(boys graduated and study Maths) + #(boys graduated and not study Math) + #(girls graduated study Math) + #(girls not graduated study Math)
≥ #(boys graduated and study Maths) + #(girls graduated study Math)
= #(people graduated and study Maths)
= #(boys graduated and study Maths) + #(boys graduated and not study Math) + #(girls graduated study Math) + #(girls not graduated study Math)
≥ #(boys graduated and study Maths) + #(girls graduated study Math)
= #(people graduated and study Maths)
收錄日期: 2021-04-15 17:51:51
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20150109000051KK00056