[理工] 機率
From an ordinary dexk of 52 cards,we draw cards at random and
without replacement until only cards of one suit are left.Find
the prob. that the cards left are all spades.
我的想法是把其他三種挑完就剩下一種
39!
———
52P39
答案是1/4
是我哪裡想錯了嗎?
--
※ 發信站: 批踢踢實業坊(ptt.cc)
◆ From: 42.65.149.21
推
09/13 20:03, , 1F
09/13 20:03, 1F
→
09/13 20:03, , 2F
09/13 20:03, 2F
→
09/13 20:17, , 3F
09/13 20:17, 3F
→
09/13 20:18, , 4F
09/13 20:18, 4F
→
09/13 22:56, , 5F
09/13 22:56, 5F
推
09/13 23:00, , 6F
09/13 23:00, 6F
推
09/13 23:05, , 7F
09/13 23:05, 7F
→
09/13 23:05, , 8F
09/13 23:05, 8F
推
09/13 23:06, , 9F
09/13 23:06, 9F
A:only one suit are left
B:the cards left are all spades
P(B|A)=1/4
是這個意思嗎?
※ 編輯: KAINTS 來自: 42.65.149.21 (09/13 23:32)
推
09/13 23:36, , 10F
09/13 23:36, 10F
→
09/13 23:37, , 11F
09/13 23:37, 11F
推
09/13 23:42, , 12F
09/13 23:42, 12F
→
09/13 23:42, , 13F
09/13 23:42, 13F
→
09/13 23:43, , 14F
09/13 23:43, 14F
→
09/13 23:45, , 15F
09/13 23:45, 15F
→
09/13 23:46, , 16F
09/13 23:46, 16F
→
09/13 23:46, , 17F
09/13 23:46, 17F
討論串 (同標題文章)
