回复:回复:5/36

回答: 5/36pj2010-02-03 13:04:32

1/2*1/2 --- for odd numbers
1/9 ---- for 9 which is not prime number

1/4-1/9=5/36

所有跟帖: 

回复:回复:回复:5/36 -Jinjing- 给 Jinjing 发送悄悄话 (78 bytes) () 02/07/2010 postreply 07:52:16

You are right! -pj- 给 pj 发送悄悄话 (0 bytes) () 02/08/2010 postreply 14:08:47

回复:回复:回复:5/36 -wxczcbm- 给 wxczcbm 发送悄悄话 (160 bytes) () 02/07/2010 postreply 22:20:10

回复:回复:回复:回复:5/36 -greenfarm- 给 greenfarm 发送悄悄话 (0 bytes) () 02/08/2010 postreply 10:13:27

you are right. possibility for odd number is wrong -pj- 给 pj 发送悄悄话 (27 bytes) () 02/08/2010 postreply 14:09:53

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