兒子拿回來的題, 搞不出了, 請大家幫忙

P1,P2,P3,P4,P5都是一個水泵,每個泵都隻有50%的機會工作.請問把水從A送到B的幾率有多大?

所有跟帖： 

• I think it is answer. -jinjing- ♀ (180 bytes) () 06/18/2010 postreply 17:29:48

• 回複：I think it is answer. -rorodad- ♂ (17 bytes) () 06/18/2010 postreply 17:47:24

• 回複：回複：I think it is answer. -jinjing- ♀ (40 bytes) () 06/18/2010 postreply 18:11:07

• 回複：回複：回複：I think it is answer. -rorodad- ♂ (60 bytes) () 06/18/2010 postreply 18:16:55

• 回複：回複：回複：回複：I think it is answer. -jinjing- ♀ (112 bytes) () 06/18/2010 postreply 19:44:07

• we get together. -皆兄弟也- ♂ (0 bytes) () 06/18/2010 postreply 20:11:46

• (19*0+12*1+1*2)/32=7/16, right? -皆兄弟也- ♂ (135 bytes) () 06/18/2010 postreply 20:10:28

• 回複：(19*0+12*1+1*2)/32=7/16, right? -jinjing- ♀ (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- ♂ (0 bytes) () 06/18/2010 postreply 21:53:14

• my answer: 39/64 -twfx- ♂ (39 bytes) () 06/19/2010 postreply 14:18:53

• formula are ...,the denometer can't be 64. -jinjing- ♀ (0 bytes) () 06/19/2010 postreply 19:25:24

• correct -wfmi- ♂ (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- ♂ (0 bytes) () 06/19/2010 postreply 10:40:08

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

• You are correct. -ManYou- ♂ (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- ♂ (0 bytes) () 06/30/2010 postreply 18:41:37

• 回複：兒子拿回來的題, 搞不出了, 請大家幫忙 -bhm- ♀ (18 bytes) () 06/20/2010 postreply 01:02:38

• 回複：回複：兒子拿回來的題, 搞不出了, 請大家幫忙 -bhm- ♀ (1507 bytes) () 06/20/2010 postreply 01:05:05

• almost all good, but 01010 and some other one ...not good -jinjing- ♀ (0 bytes) () 06/20/2010 postreply 08:58:02

• 10001,11001 are wrong,01010 is right.your order is too special. -jinjing- ♀ (34 bytes) () 06/20/2010 postreply 09:34:47

• 回複：兒子拿回來的題, 搞不出了, 請大家幫忙 -crazy_math- ♂ (53 bytes) () 06/21/2010 postreply 20:45:34

• Simplify -badminton- ♂ (156 bytes) () 06/25/2010 postreply 09:28:55

• 87.5% -bwhahaha- ♂ (0 bytes) () 06/27/2010 postreply 09:51:04

• 回複：兒子拿回來的題, 搞不出了, 請大家幫忙 -tony_ren- ♂ (400 bytes) () 07/03/2010 postreply 20:18:37

• 回複：回複：兒子拿回來的題, 搞不出了, 請大家幫忙 -tony_ren- ♂ (74 bytes) () 07/03/2010 postreply 20:25:31

• your formula are good,but opperation is.... -jinjing- ♀ (164 bytes) () 07/04/2010 postreply 15:07:20

• 回複：Still not correct, but thanks.... -tony_ren- ♂ (117 bytes) () 07/04/2010 postreply 19:19:37

• P(A5A2A5A3A4A3)=1/16 ,it is not 1/8,last term is-1/32 -jinjing- ♀ (23 bytes) () 07/05/2010 postreply 07:30:05

• 19/32 -INTEGRIN- ♂ (574 bytes) () 08/04/2010 postreply 11:32:17