Qu¨¢ tin v¨¤o i ca tr¨ºn Soi cu x s y¨ºn tm rinh thng Snh: 5 l¨¢ li¨ºn tip, khng bt buc ch¨²ng phi c¨´ng cht. HTTET Khai xun ph¨² qu ¨C Ho¨¤n tr nh Cc ba: Khi bn d o¨¢n rng 3 mt x¨ª ngu ging nhau th¨¬ t v¨¤o ca n¨¤y. Vi 100 im tin vn khi thng thu v 15000 tin li. Mo chi t¨¤i xu cho ngi mi l¨¤ n¨ºn tr¨¢nh ca n¨¤y. D¨¤n 10 s l¨¤ g¨¬? Hiu r t l tr thng Cng nh vic t¨¬m hiu v l xi¨ºn nh¨¢y hay bt c loi l n¨¤y. y l¨¤ h¨¬nh thc la chn v¨¤ d o¨¢n 3 cp s may mn. ¨¢nh gi¨¢ d liu thng k¨º trc gi thi u Odd xi¨ºn = H s k¨¨o thng x [(h s k¨¨o n ¨C 1)/2] x ( nu k¨¨o thua na) x 1 (nu k¨¨o h¨°a) x ¡­vi h s k¨¨o n. B¨¬nh lun vi¨ºn chuy¨ºn nghip l¨¤m tng cm gi¨¢c kch t¨ªnh ¨¢nh gi¨¢ d liu thng k¨º trc gi thi u

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