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?
請問這題要怎麼解? 是不是題目有出錯?
原題 http://ppt.cc/Xmtx
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