作者mqazz1 (无法显示)
看板Math
标题[离散] 排容 恰好一个
时间Sat Aug 6 20:19:39 2011
professor Chen gave his Digital Design class a test consisting of three
questions. There are fifty students in his class. Three students did not
answer any question. Ten students did not answer the first question,
fourteen failed to answer the second question, and tweleve did not answer the
third question. If eighteen students answered all three questions
(a) how many answered exactly one question?
请问这题要怎麽解? 是不是题目有出错?
原题
http://ppt.cc/Xmtx
谢谢
--
※ 发信站: 批踢踢实业坊(ptt.cc)
◆ From: 218.166.113.236