gensy850711

first divide it into 3 groups... 4 for each group...
) L: G; I6 I& C" F  ?3 \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...5.39.217.76# q' _' X. _% ?" L
den... left 4 balls...tvb now,tvbnow,bttvb( K2 j- z6 |. v9 N7 j
when u use tat 3 groups to test... u oredi know it is heavier or not...公仔箱論壇( ?. Q% R" |0 e- f$ h: k7 d- f
so when testing these 4 balls... u juz nit 2 find out the heavier or lighter 1...
1 k8 w0 a. {9 z0 w: jtvb now,tvbnow,bttvbtake the heavier or lighter 1... throw away tat 2 normal ball...
; F" i1 |8 k! [) t& |  R" v4 g5.39.217.76den u juz nit 2 test the last 2 balls...; @) p; m* f, |
same for now... take the heavier or lighter 1...