[問題] 39樂合中二合的機率算法
請問數學高手
39樂合彩中二合(39開5中其中之二)的機率怎麼算?
我以39中二 39C2 來算是1/741 (誤)
三合39中三 39C3 來算是1/9139 (誤誤)
請大大指教...囧rz
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