看板 Math 關於我們 聯絡資訊
※ 引述《xy210742 (Sam)》之銘言: : 各位大大好 : http://i.imgur.com/M7xt4IQ.jpg
: 請問該題機率應如解才是呢 : 感謝大大解惑 : 謝謝 1紅2白 → 1紅2白: C(2,2)/C(3,2) *1 = 1/3 C(1,1)*C(2,1)/C(3,2) * C(1,1)*C(4,1)/C(5,2) = 4/15 (+ ________________ 3/5 1紅2白 → 3白 :2/5 ------------------------------------------------------------------- 3白 → 1紅2白: 1 * C(1,1)*C(4,2)/C(5,2) = 2/5 3白 → 3白: 1 * C(4,2)/C(5,2) = 3/5 ------------------------------------------------------------------- ┌3/5 2/5┐┌3/5 2/5┐┌3/5 2/5┐┌1┐ └2/5 3/5┘└2/5 3/5┘└2/5 3/5┘└0┘ = 63/125 -- http://attachment.van698.com/forum/201511/30/225019fywnza6atswsh36t.gif
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