#1
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ãËé S = {1,2,3,4,5,6,7} áÅéǨ§ËÒ n(X) c]t n(Y)
àÁ×èÍ¡Ó˹´ X={A\in P(S)\mid 1\in A áÅÐ 7\not\ni A} áÅÐ Y={A\in X\mid ¼ÅºÇ¡¢Í§ÊÁÒªÔ¡ÀÒÂã¹ A äÁèà¡Ô¹6} |
#2
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ã¤Ã¡çä´é ªèÇÂá»Å⨷Âì¢é͹Õé·Õ
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#3
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¼ÁÇèÒ Åͧ¾Ô¨ÒóҴÕæ ÁѹäÁèÂÒ¡¤ÃѺ
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#4
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áÅéÇàÃÒ¨ÐËÒÂѧ䧵èÍÅФÃѺ
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#5
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$\not\ni $ µÑǹÕé¤×ÍÍÐäÃËÃͤÃѺ äÁèÃÙé¨Ñ¡ÍèÐ
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#6
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"૵AÍÂÙèã¹¾ÒÇàÇÍÃì૵S â´Â·ÕèÁÕ1à»ç¹ÊÁÒªÔ¡áÅÐäÁèÁÕ7à»ç¹ÊÁÒªÔ¡" ¨Ðä´é $X = ${{$1$},{$1,2$},{$1,3$}$,...,${$1,2,3,4,5,6$}} à¾ÃÒЩйÑé¹ $n(X) = 2^{5} = 32$ ¾Ô¨ÒóÒ૵Y "૵AÍÂÙèã¹à«µX â´Â·ÕèÊÁÒªÔ¡ÀÒÂã¹à«µÃÇÁ¡Ñ¹¹éÍ¡ÇèÒËÃ×Íà·èҡѺ6" ¨Ðä´é $Y = ${{$1$},{$1,2$},{$1,3$},{$1,4$},{$1,5$},{$1,2,3$}} $n(Y) = 6$ ¤ÓµÍº n(X) = 32 áÅÐ n(Y) = 6 Q.E.D. «Ö觵éͧ¾ÔÊÙ¨¹ì¤ÃѺ -.- 21 ÁԶعÒ¹ 2009 20:16 : ¢éͤÇÒÁ¹Õé¶Ù¡á¡éä¢áÅéÇ 1 ¤ÃÑé§, ¤ÃÑé§ÅèÒÊØ´â´Â¤Ø³ fOrgetfuL` à˵ؼÅ: ãªé¤ÓÊÑè§LaTeX |
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