回复：3 times are enough for 13 balls

反复地数了有数，13个字母从a应当数到m？
3次找出次品轻重，还是只能12个吧？（前面我看错题了）

所有跟帖： 

• not big deal,careless,3 times are enough for 13 balls -jinjing- ♀ (273 bytes) () 05/02/2010 postreply 18:03:21

• 回复：not big deal,careless,3 times are enough for 13 balls -wushuihe- ♂ (25 bytes) () 05/03/2010 postreply 01:52:46