送交者: 草绿 于 July 27, 2009 22:50:07:
回答: 这个条件应该没有必要 由 逻辑 于 July 27, 2009 19:37:23:
The question "What is the greatest number of people with the same color hair" doesn't explicitly say both colors and can easily be understood as a single color. So if all 100 people are red hair, the answer would be different.
It would be much clearer to explicitly say "considering all arrangements and both colors" in the problem.
你认为的关键词"sure" is also one I consider problematic. 从字面上理解，"sure" means one can sure find that greatest number N for every arrangement, not what you say "至少有N个人". 这个wording不严谨and confusing.
Anyway, the disagreement is on wording, no big deal.