儿子拿回来的题, 搞不出了, 请大家帮忙

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P1,P2,P3,P4,P5都是一个水泵,每个泵都只有50%的机会工作.请问把水从A送到B的几率有多大?

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I think it is answer. -jinjing- 给 jinjing 发送悄悄话 (180 bytes) () 06/18/2010 postreply 17:29:48

回复:I think it is answer. -rorodad- 给 rorodad 发送悄悄话 (17 bytes) () 06/18/2010 postreply 17:47:24

回复:回复:I think it is answer. -jinjing- 给 jinjing 发送悄悄话 (40 bytes) () 06/18/2010 postreply 18:11:07

回复:回复:回复:I think it is answer. -rorodad- 给 rorodad 发送悄悄话 (60 bytes) () 06/18/2010 postreply 18:16:55

回复:回复:回复:回复:I think it is answer. -jinjing- 给 jinjing 发送悄悄话 (112 bytes) () 06/18/2010 postreply 19:44:07

we get together. -皆兄弟也- 给 皆兄弟也 发送悄悄话 皆兄弟也 的博客首页 (0 bytes) () 06/18/2010 postreply 20:11:46

(19*0+12*1+1*2)/32=7/16, right? -皆兄弟也- 给 皆兄弟也 发送悄悄话 皆兄弟也 的博客首页 (135 bytes) () 06/18/2010 postreply 20:10:28

回复:(19*0+12*1+1*2)/32=7/16, right? -jinjing- 给 jinjing 发送悄悄话 (39 bytes) () 06/18/2010 postreply 20:22:27

don't say that! it is funny we reached the same point. -皆兄弟也- 给 皆兄弟也 发送悄悄话 皆兄弟也 的博客首页 (0 bytes) () 06/18/2010 postreply 21:53:14

my answer: 39/64 -twfx- 给 twfx 发送悄悄话 (39 bytes) () 06/19/2010 postreply 14:18:53

formula are ...,the denometer can't be 64. -jinjing- 给 jinjing 发送悄悄话 (0 bytes) () 06/19/2010 postreply 19:25:24

correct -wfmi- 给 wfmi 发送悄悄话 wfmi 的博客首页 (0 bytes) () 06/28/2010 postreply 11:48:50

It should be: (1/2+1/4+1/8)*(1/2+1/4)=21/32 -ManYou- 给 ManYou 发送悄悄话 (0 bytes) () 06/19/2010 postreply 10:40:08

If p1,p3;p2,p4 had been connecded,you would be right -jinjing- 给 jinjing 发送悄悄话 (0 bytes) () 06/19/2010 postreply 19:51:10

You are correct. -ManYou- 给 ManYou 发送悄悄话 (4 bytes) () 06/30/2010 postreply 17:13:45

It got to same anwser: (1/2+1/4+1/8)*(1/2+1/4)*4/6=7/16 -ManYou- 给 ManYou 发送悄悄话 (0 bytes) () 06/30/2010 postreply 18:41:37

回复:儿子拿回来的题, 搞不出了, 请大家帮忙 -bhm- 给 bhm 发送悄悄话 bhm 的博客首页 (18 bytes) () 06/20/2010 postreply 01:02:38

回复:回复:儿子拿回来的题, 搞不出了, 请大家帮忙 -bhm- 给 bhm 发送悄悄话 bhm 的博客首页 (1507 bytes) () 06/20/2010 postreply 01:05:05

almost all good, but 01010 and some other one ...not good -jinjing- 给 jinjing 发送悄悄话 (0 bytes) () 06/20/2010 postreply 08:58:02

10001,11001 are wrong,01010 is right.your order is too special. -jinjing- 给 jinjing 发送悄悄话 (34 bytes) () 06/20/2010 postreply 09:34:47

回复:儿子拿回来的题, 搞不出了, 请大家帮忙 -crazy_math- 给 crazy_math 发送悄悄话 crazy_math 的博客首页 (53 bytes) () 06/21/2010 postreply 20:45:34

Simplify -badminton- 给 badminton 发送悄悄话 (156 bytes) () 06/25/2010 postreply 09:28:55

87.5% -bwhahaha- 给 bwhahaha 发送悄悄话 (0 bytes) () 06/27/2010 postreply 09:51:04

回复:儿子拿回来的题, 搞不出了, 请大家帮忙 -tony_ren- 给 tony_ren 发送悄悄话 (400 bytes) () 07/03/2010 postreply 20:18:37

回复:回复:儿子拿回来的题, 搞不出了, 请大家帮忙 -tony_ren- 给 tony_ren 发送悄悄话 (74 bytes) () 07/03/2010 postreply 20:25:31

your formula are good,but opperation is.... -jinjing- 给 jinjing 发送悄悄话 (164 bytes) () 07/04/2010 postreply 15:07:20

回复:Still not correct, but thanks.... -tony_ren- 给 tony_ren 发送悄悄话 (117 bytes) () 07/04/2010 postreply 19:19:37

P(A5A2A5A3A4A3)=1/16 ,it is not 1/8,last term is-1/32 -jinjing- 给 jinjing 发送悄悄话 (23 bytes) () 07/05/2010 postreply 07:30:05

19/32 -INTEGRIN- 给 INTEGRIN 发送悄悄话 (574 bytes) () 08/04/2010 postreply 11:32:17

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