gensy850711

first divide it into 3 groups... 4 for each group...
1 K4 F% \1 J% [2 c/ e% ~9 m+ ATVBNOW 含有熱門話題，最新最快電視，軟體，遊戲，電影，動漫及日常生活及興趣交流等資訊。den use 2 groups to test... if the weight is same... den throw away these 2 groups.. if not... use another 1 group to test with tat 2 groups... throw away the same weight groups...
* C$ K. E7 |# x, Kden... left 4 balls...
" p# h4 }0 p9 pTVBNOW 含有熱門話題，最新最快電視，軟體，遊戲，電影，動漫及日常生活及興趣交流等資訊。when u use tat 3 groups to test... u oredi know it is heavier or not...
! Q3 y* K+ E0 k' O: z6 B/ Oso when testing these 4 balls... u juz nit 2 find out the heavier or lighter 1...$ k- I9 m4 r" c' I/ h
take the heavier or lighter 1... throw away tat 2 normal ball...
8 d; p9 f% P& h) Stvb now,tvbnow,bttvbden u juz nit 2 test the last 2 balls...
. z; N) i9 x  p9 ssame for now... take the heavier or lighter 1...