回复:回复:回复:5/36

来源: wxczcbm 2010-02-07 22:20:10 [] [旧帖] [给我悄悄话] 本文已被阅读: 次 (160 bytes)
回答: 回复:5/36jinjing2010-02-04 14:07:29
The 1/4 for add numbers is wrong. Should be:
1/2 + 1/36 = 19/36 --- for one odd, one even number, plus (1, 1).
so the anser is:
19/36 - 1/9 = 5/12.

所有跟帖: 

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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