※ 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
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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
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┌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
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※ 編輯: Tiderus (123.240.91.95), 12/01/2015 14:31:13