Yes. You may want to google venn diagram.

來源: BeLe 於 2012-02-12 08:21:55 [] [博客] [舊帖] [給我悄悄話] 閱讀數 : (96 bytes)
回答: 3個全選的算進去了嗎? 由 清清涼 於 2012-02-12 08:14:23

For more complicated such kinds of problems,, Principle of Inclusion-Exclusion is the way to go.

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• 謝謝 -清清涼- ♀ 給 清清涼 發送悄悄話 (0 bytes) () 02/12/2012 postreply 08:56:44

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