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#1
20 Á¡ÃÒ¤Á 2011, 22:34
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#4
20 Á¡ÃÒ¤Á 2011, 22:58
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¡Ã³Õáá ¤ÃÙ3¤¹¹Í¹Ëéͧ·ÕèÊͧ ¹Ñ¡àÃÕ¹·ÕèàËÅ×ͨѴŧä´é$\frac{6!}{2!4!} $
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#5
20 Á¡ÃÒ¤Á 2011, 22:59
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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
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