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#1
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¤ÃÙ 3 ¤¹ ¹Ó¹Ñ¡àÃÕ¹ 6 ¤¹ä»à¢éÒ¤èÒÂÇÔªÒ¡Òà àÁ×èÍ件֧ºéÒ¹¾Ñ¡«Öè§ÁÕ 3 Ëéͧ¹Í¹ Ëéͧáá¹Í¹ä´é 2 ¤¹ Ëéͧ·ÕèÊͧ¹Í¹ä´é 3 ¤¹ áÅÐËéͧ·Õè 3¹Í¹ä´é 4 ¤¹ ¨§ËҨӹǹÇÔ¸Õ·Õèáºè§¤¹à¢éÒËéͧ¹Í¹â´ÂãËé¤ÃÙ·Ñé§ 3 ¤¹¹Í¹ã¹Ëéͧà´ÕÂǡѹ ¼Á¤Ô´ä´é 75 ÇÔ¸Õ áµèµÑÇàÅ×Í¡Áմѧ¹Õé¤ÃѺ ¡. 100 ¢. 105 ¤. 120 ¤.125 Íѹ¹ÕéàÍÒÁÒ¨Ò¡àÍ¡ÊÒõÔÇÊͺ a-net ¢Í§ÍÒ¨ÒÃÂì ÃÈ.´Ã.¡ÄɳРà¹ÕÂÁÁ³Õ ¤ÃѺ ú¡Ç¹ªèǪÕéá¹Ð´éǤÃѺ 20 Á¡ÃÒ¤Á 2011 22:37 : ¢éͤÇÒÁ¹Õé¶Ù¡á¡éä¢áÅéÇ 1 ¤ÃÑé§, ¤ÃÑé§ÅèÒÊØ´â´Â¤Ø³ mebius |
#2
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ä´éà·èҡѹ¤ÃѺ
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#3
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¶ÒÁÇèÒ¤Ô´¼Ô´µÃ§ä˹
¡ç¹èÒ¨ÐŧÃÒÂÅÐàÍÕ´ÇÔ¸Õ¤Ô´ãËé´éǹФÃѺ (¨Ðä´éªÕéᨧä´é¶Ù¡ ËÒ¡¼Ô´¨ÃÔ§æ) áµè ´ÙáÅéǵÑÇàÅ×Í¡¹èҨмԴàͧ |
#4
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¡Ã³Õáá ¤ÃÙ3¤¹¹Í¹Ëéͧ·ÕèÊͧ ¹Ñ¡àÃÕ¹·ÕèàËÅ×ͨѴŧä´é$\frac{6!}{2!4!} $
¡Ã³Õ·ÕèÊͧ ¤ÃÙ3¤¹¹Í¹Ëéͧ·ÕèÊÒÁ àËÅ×Í·ÕèÇèÒ§Íա˹Öè§·Õ ¨Ñ´¹Ñ¡àÃÕ¹ä´é$\frac{6!}{2!3!} $ ÃÇÁ¨Ñ´ä´éà·èҡѺ$15+60=75$ ¼Á¡ç¤Ô´ä´éà·èҡѺ·Õèà¨éҢͧ¡ÃзÙé¤Ô´
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"¶éÒàÃÒÅéÁºèÍÂæ ã¹·ÕèÊØ´àÃÒ¨ÐÃÙéÇèÒ¶éÒ¨ÐÅéÁ ÅéÁ·èÒä˹¨Ðà¨çº¹éÍ·ÕèÊØ´ áÅÐÃÙéÍÕ¡ÇèÒµèÍä»·ÓÂѧ䧨ÐäÁèãËéÅéÁÍÕ¡ ´Ñ§¹Ñ鹨§ÍÂèÒ¡ÅÑÇ·Õè¨ÐÅéÁ"...ÍÒ¨ÒÃÂìÍӹǠ¢¹Ñ¹ä·Â ¤ÃÑé§áá㹪ÕÇÔµ·ÕèÊͺ¤³ÔµÊÁÒ¤Á¤³ÔµÈÒʵÃìàÁ×èÍ»Õ2533...¼Áä´éá¤è24¤Ðá¹¹(¨Ò¡ÃéͤÐá¹¹) |
#5
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¡Ã³Õ 1 ¤ÃÙà¢éҾѡËéͧ·Õè¹Í¹ä´é 3 ¤¹
ÇԸըѴ = $\binom{6}{4} x \binom{2}{2} $ = 15 ¡Ã³Õ 2 ¤ÃÙà¢éҾѡËéͧ·Õè¹Í¹ä´é 4 ¤¹ ÇԸըѴ = $\binom{6}{1} x \binom{5}{3} x \binom{2}{2} $ = 60 ä´é 75 ÇÔ¸Õ µÑÇàÅ×Í¡¹èҨмԴ¤ÃѺ |
#6
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ä´é 75 àËÁ×͹¡Ñ¹¤ÃѺ
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#7
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¼Á¡çä´é 60 + 15 = 75 ¤ÃѺ
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