first divide it into 3 groups... 4 for each group...
( x; J$ h8 F4 w! S- ~' vtvb now,tvbnow,bttvbden 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...tvb now,tvbnow,bttvb9 O. k! \" q. g4 G8 o
den... left 4 balls...+ K, d# S8 @3 s' \" h
when u use tat 3 groups to test... u oredi know it is heavier or not.... C& g% U- s- u' H/ W
so when testing these 4 balls... u juz nit 2 find out the heavier or lighter 1...
" a; j3 ]9 ~1 N1 @" j5 |tvb now,tvbnow,bttvbtake the heavier or lighter 1... throw away tat 2 normal ball...
) X* L2 l/ y/ z公仔箱論壇den u juz nit 2 test the last 2 balls...
4 s; K5 l* J. p9 Itvb now,tvbnow,bttvbsame for now... take the heavier or lighter 1... |