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49樂合彩機率
Sep 30th 2013, 17:30

知識問題|

發問者: Yang ( 初學者 4 級)
發問時間: 2013-10-01 01:30:45 ( 還有 23 小時發問到期 )
解答贈點: 5 ( 共有 0 人贊助 )
回答: 0 0

二合的分子為什麼是C(6,2)不是C(2,2)?

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